# Opinion polling for the 2021 Icelandic parliamentary election

In the run up to the 2021 Icelandic parliamentary election, various organisations carried out opinion polling to gauge voting intention in Iceland during the term of the Althing. This article lists the results of such polls. The date range for these opinion polls is from the previous election, held on 28 October 2017, to the present day.
The 2021 elections were to be held on 25 September 2021. By law, the election had to be held on or before 23 October 2021. In July 2020, Prime Minister Katrín Jakobsdóttir proposed the date 25 September as the election date. The date of the election was officially published on 12 August.
Polls are listed in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the highest figures. When a poll has no information on a certain party, that party is instead marked by a dash (–).

## Graphical summary

D = Independence Party, V = Left-Green Movement, S = Social Democratic Alliance, M = Centre Party, B = Progressive Party, P = Pirate Party, F = People's Party, C = Viðreisn, J = Socialist Party.

## Polls

| Polling firm | Fieldwork date | Sample size | Resp. | D | V | S | M | B | P | F | C | J | Others | Lead |
| 2021 parliamentary election | 25 Sep 2021 | – | – | 24.4 | 12.6 | 9.9 | 5.4 | 17.3 | 8.6 | 8.8 | 8.3 | 4.1 | 0.5 | 7.1 |
| Maskína | 22–24 Sep 2021 | 5,836 | TBA | 21.4 | 10.5 | 13.8 | 5.5 | 15.4 | 10.2 | 6.2 | 10.1 | 6.1 | 0.8 | 6.0 |
| Gallup | 20—24 Sep 2021 | 4,809 | — | 23.4 | 12.0 | 12.6 | 6.8 | 14.9 | 8.8 | 6.4 | 9.2 | 5.3 | 0.6 | 8.5 |
| MMR | 22–23 Sep 2021 | — | – | 22.9 | 9.7 | 11.5 | 5.8 | 16.4 | 9.9 | 6.2 | 12.0 | 5.1 | 0.5 | 6.5 |
| MMR | 21–22 Sep 2021 | 909 | – | 21.8 | 11.0 | 13.9 | 4.7 | 14.3 | 10.7 | 7.3 | 10.1 | 6.0 | 0.2 | 7.5 |
| Maskína | 15–22 Sep 2021 | TBA | TBA | 20.6 | 11.5 | 11.7 | 7.1 | 13.4 | 11.3 | 5.6 | 11.4 | 6.6 | 0.8 | 7.2 |
| Prósent | 17–21 Sep 2021 | 2500 | 50 | 20.1 | 10.7 | 14.7 | 6.6 | 12.2 | 13.1 | 5.2 | 9.3 | 6.9 | 1.2 | 5.4 |
| Gallup | 13–19 Sep 2021 | 3,845 | — | 21.2 | 10.2 | 12.7 | 6.2 | 13.2 | 11.5 | 7.0 | 10.2 | 7.3 | 0.5 | 8.0 |
| MMR | 15–17 Sep 2021 | 1,257 | – | 20.3 | 12.1 | 13.0 | 4.6 | 12.7 | 11.8 | 5.6 | 10.7 | 8.6 | 0.6 | 7.6 |
| Prósent | 13–16 Sep 2021 | 1,493 | – | 21.3 | 10.0 | 14.2 | 5.9 | 12.6 | 11.5 | 4.7 | 11.6 | 7.7 | 0.5 | 7.1 |
| Maskína | 8–13 Sep 2021 | TBA | TBA | 21.0 | 11.5 | 14.6 | 5.5 | 12.0 | 13.3 | 3.6 | 12.3 | 6.1 | – | 6.4 |
| Gallup | 30 Aug–12 Sep 2021 | 5,828 | 51.1 | 22.0 | 11.8 | 11.0 | 7.6 | 12.9 | 11.0 | 4.9 | 9.9 | 7.8 | 1.1 | 10.2 |
| MMR | 8–10 Sep 2021 | – | – | 22.3 | 10.5 | 11.6 | 6.0 | 15.0 | 9.9 | 5.0 | 12.2 | 6.7 | 0.8 | 7.3 |
| Gallup | 15—29 Aug 2021 | 4,329 | 53.3 | 24.2 | 12.3 | 11.5 | 7.0 | 9.7 | 10.9 | 4.9 | 10.6 | 8.2 | 0.7 | 12.1 |
| MMR | 24 Aug 2021 | – | – | 23.9 | 10.9 | 10.5 | 6.2 | 12.5 | 10.6 | 5.1 | 10.4 | 8.7 | 1.2 | 11.3 |
| Maskína | 13–23 Aug 2021 | 822 | TBA | 23.4 | 14.2 | 13.0 | 5.1 | 12.6 | 9.9 | 4.2 | 10.7 | 6.9 | – | 8.8 |
| Gallup | 29 July–15 August 2021 | 6,238 | — | 24.5 | 14.1 | 11.2 | 6.7 | 10.4 | 12.6 | 4.1 | 9.1 | 6.7 | 0.6 | 10.4 |
| Gallup | 30 June–28 July 2021 | 3,800 | — | 24.1 | 13.8 | 12.3 | 7.4 | 11.9 | 12.2 | 4.0 | 8.7 | 5.4 | 0.2 | 10.3 |
| Maskína | July 2021 | TBA | TBA | 20.9 | 14.1 | 13.7 | 5.5 | 9.9 | 12.7 | 4.2 | 12.3 | 6.3 | – | 6.8 |
| Prósent | 15–23 Jul 2021 | 2,600 | – | 23.6 | 11.9 | 12.6 | 5.6 | 10.6 | 13.3 | 5.0 | 10.1 | 6.1 | 1.2 | 10.3 |
| MMR | 24 Jun–6 Jul 2021 | 2,041 | – | 25.4 | 11.9 | 10.6 | 6.6 | 12.3 | 12.2 | 5.5 | 9.1 | 5.3 | 1.2 | 12.1 |
| Gallup | 1–29 June 2021 | 8,120 | 51.6 | 24.1 | 14.7 | 9.9 | 7.5 | 10.3 | 12.9 | 4.2 | 10.9 | 5.4 | 0.1 | 9.4 |
| Maskína | June 2021 | TBA | TBA | 23.8 | 15.0 | 12.4 | 5.0 | 11.4 | 11.6 | 4.2 | 12.3 | 4.3 | – | 8.8 |
| MMR | 4–14 June 2021 | 973 | – | 27.0 | 12.4 | 11.2 | 7.3 | 8.8 | 13.1 | 5.5 | 7.8 | 5.3 | 1.6 | 13.9 |
| MMR | 25 May–1 June 2021 | 951 | – | 24.6 | 11.1 | 10.9 | 6.5 | 12.5 | 13.5 | 2.8 | 11.0 | 5.6 | 1.6 | 11.1 |
| Gallup | 1–31 May 2021 | 11,779 | 48.7 | 23.5 | 14.7 | 12.4 | 7.2 | 10.4 | 11.0 | 4.3 | 10.9 | 5.4 | 0.2 | 8.8 |
| MMR | 7–12 May 2021 | 953 | – | 25.6 | 13.1 | 10.9 | 5.7 | 12.6 | 11.3 | 3.3 | 10.6 | 5.7 | 1.2 | 12.5 |
| MMR | 21–28 April 2021 | 946 | – | 28.7 | 12.9 | 11.3 | 5.8 | 10.6 | 9.6 | 4.8 | 8.8 | 6.0 | 1.5 | 14.8 |
| Gallup | Apr 2021 | TBA | TBA | 23.8 | 14.3 | 12.0 | 8.2 | 10.1 | 12.0 | 4.7 | 9.6 | 5.0 | 0.3 | 9.5 |
| MMR | 29 Mar–7 April 2021 | 940 | – | 23.1 | 10.1 | 15.4 | 6.9 | 11.5 | 13.2 | 4.7 | 10.0 | 4.0 | 1.0 | 7.7 |
| Gallup | 1-29 Mar 2021 | 9,856 | 53.0 | 23.0 | 12.3 | 12.7 | 9.5 | 11.1 | 11.5 | 5.0 | 9.5 | 5.0 | 0.4 | 10.3 |
| MMR | 5–10 Mar 2021 | 951 | – | 21.0 | 11.7 | 13.8 | 9.3 | 12.7 | 11.5 | 5.1 | 10.0 | 3.8 | 1.0 | 7.2 |
| Gallup | 1-28 Feb 2021 | 9,078 | 52.5 | 22.9 | 13.4 | 14.4 | 7.3 | 10.3 | 12.2 | 4.0 | 9.4 | 5.8 | - | 8.5 |
| MMR | 12–18 Feb 2021 | 919 | – | 22.2 | 13.5 | 13.1 | 8.0 | 11.4 | 11.4 | 3.6 | 10.6 | 4.1 | 2.0 | 8.7 |
| Gallup | 6–31 Jan 2021 | 9,019 | 51.4 | 22.7 | 12.8 | 16.6 | 8.0 | 9.5 | 11.1 | 3.9 | 11.7 | 3.8 | – | 6.1 |
| MMR | 30 Dec 2020–11 Jan 2021 | 2,002 | - | 24.4 | 10.9 | 15.6 | 8.6 | 9.1 | 12.3 | 4.9 | 8.8 | 4.4 | 1.0 | 8.8 |
| Gallup | 1 Dec 2020–3 Jan 2021 | 10,958 | 51.5 | 23.7 | 11.7 | 17.0 | 9.1 | 8.3 | 11.9 | 4.3 | 10.0 | 3.8 | – | 6.7 |
| Zenter | 11–19 Dec 2020 | 2,500 | 52.8 | 22.9 | 10.2 | 15.6 | 6.7 | 7.3 | 17.0 | 4.7 | 10.2 | 3.3 | 2.1 | 5.9 |
| MMR | 26 Nov–3 Dec 2020 | 944 | - | 27.1 | 7.6 | 13.8 | 7.0 | 7.5 | 13.8 | 6.2 | 9.5 | 5.0 | 2.3 | 12.3 |
| Gallup | 2–30 Nov 2020 | 9,351 | 53.6 | 23.7 | 11.8 | 17.1 | 8.8 | 8.6 | 12.4 | 4.1 | 9.7 | 3.7 | – | 6.6 |
| MMR | 6–11 Nov 2020 | 925 | - | 25.0 | 7.5 | 16.7 | 9.1 | 9.9 | 14.3 | 3.9 | 8.4 | 4.0 | 1.1 | 8.3 |
| Gallup | 30 Sep–1 Nov 2020 | 10,937 | 54.0 | 23.5 | 11.9 | 15.8 | 9.9 | 7.7 | 12.1 | 4.5 | 11.6 | 2.7 | – | 7.7 |
| MMR | 23–28 Oct 2020 | 933 | - | 21.9 | 8.3 | 15.2 | 11.6 | 10.2 | 13.5 | 3.8 | 9.7 | 4.6 | 1.3 | 6.7 |
| Gallup | 1–30 Sep 2020 | 9,673 | 52.9 | 23.9 | 13.7 | 14.9 | 9.4 | 6.7 | 13.2 | 3.7 | 10.4 | 3.9 | – | 9.0 |
| Maskína | 24–28 Sep 2020 | 879 | TBA | 22.7 | 10.4 | 17.9 | 5.9 | 7.8 | 15.7 | 5.5 | 14.0 | – | – | 5.2 |
| MMR | 10–23 Sep 2020 | 2,043 | - | 25.6 | 8.5 | 12.8 | 10.8 | 8.3 | 15.0 | 3.6 | 9.4 | 4.3 | 1.7 | 10.6 |
| MMR | 26 Aug–2 Sep 2020 | 929 | - | 24.0 | 9.6 | 14.9 | 8.0 | 8.9 | 14.3 | 4.8 | 10.0 | 3.4 | 2.2 | 9.1 |
| Gallup | 4–31 Aug 2020 | 9,479 | 51.9 | 22.8 | 12.6 | 14.7 | 9.9 | 7.9 | 13.7 | 3.6 | 10.6 | 3.9 | 0.3 | 8.1 |
| Gallup | 31 Jul 2020 | - | - | 23.2 | 10.9 | 14.8 | 10.6 | 7.6 | 13.9 | 4.3 | 10.8 | 3.8 | 0.1 | 8.4 |
| MMR | 23–28 Jul 2020 | 951 | - | 24.0 | 10.8 | 13.1 | 8.4 | 8.6 | 15.4 | 4.0 | 8.4 | 5.1 | 2.1 | 8.6 |
| Gallup | 02–30 Jun 2020 | 10,274 | 51.7 | 24.0 | 13.6 | 14.9 | 10.2 | 8.6 | 10.7 | 3.6 | 10.5 | 3.8 | 0.1 | 9.1 |
| MMR | 16–19 Jun 2020 | 1,045 | - | 24.3 | 10.7 | 16.3 | 8.0 | 6.1 | 13.2 | 5.4 | 10.0 | 3.5 | 2.4 | 8.0 |
| Gallup | 4 May–1 Jun 2020 | 10,630 | 54.0 | 24.6 | 14.3 | 14.4 | 10.4 | 7.7 | 11.0 | 4.4 | 9.7 | 3.3 | – | 10.2 |
| MMR | 19–25 May 2020 | 994 | - | 23.5 | 10.6 | 13.3 | 10.8 | 6.4 | 14.6 | 3.6 | 11.3 | 4.1 | 1.7 | 8.9 |
| Gallup | 30 Mar–3 May 2020 | 11,028 | 55.7 | 25.1 | 13.8 | 13.8 | 9.9 | 8.4 | 10.4 | 4.4 | 10.0 | 4.0 | – | 11.3 |
| MMR | 15–17 Apr 2020 | 1,051 | - | 22.7 | 10.4 | 13.1 | 9.5 | 9.8 | 12.3 | 4.7 | 10.0 | 5.6 | 2.0 | 9.6 |
| MMR | 3–7 Apr 2020 | 987 | - | 23.5 | 12.3 | 14.1 | 10.7 | 8.8 | 12.2 | 3.4 | 9.6 | 3.4 | 2.1 | 9.4 |
| Gallup | 2–29 Mar 2020 | 10,352 | 54.8 | 23.5 | 13.3 | 15.1 | 11.2 | 8.1 | 10.2 | 4.2 | 11.1 | 3.2 | – | 8.4 |
| MMR | 18–20 Mar 2020 | 1,034 | - | 27.4 | 9.8 | 14.7 | 10.0 | 8.1 | 10.2 | 3.7 | 9.7 | 4.7 | 0.5 | 12.7 |
| Gallup | 3 Feb–1 Mar 2020 | 7,964 | 53.8 | 22.0 | 11.9 | 14.8 | 14.2 | 7.0 | 10.7 | 4.0 | 10.3 | 5.0 | 1.9 | 7.2 |
| MMR | 6–10 Feb 2020 | 1,003 | - | 22.0 | 10.7 | 15.1 | 13.3 | 6.8 | 10.4 | 4.6 | 9.7 | 5.3 | 2.1 | 6.9 |
| Gallup | 03 Jan–02 Feb 2020 | 8,678 | 51.8 | 21.6 | 10.5 | 17.7 | 12.5 | 7.8 | 11.5 | 4.2 | 10.3 | 3.4 | – | 3.9 |
| MMR | 28 Jan 2020 | - | - | 19.0 | 8.7 | 16.6 | 15.1 | 7.2 | 10.6 | 3.8 | 12.4 | 4.9 | 1.9 | 2.4 |
| MMR | 3–13 Jan 2020 | 2,057 | - | 20.3 | 11.1 | 16.8 | 12.9 | 8.2 | 11.0 | 3.5 | 10.5 | 4.1 | 1.5 | 3.5 |
| Gallup | 2 Dec 2019–1 Jan 2020 | 8,511 | 52.8 | 22.7 | 10.7 | 13.9 | 12.7 | 8.6 | 11.3 | 4.3 | 12.0 | 3.3 | – | 8.8 |
| MMR | 13–19 Dec 2019 | 1,014 | - | 20.0 | 10.3 | 14.4 | 14.3 | 8.3 | 11.8 | 4.0 | 10.5 | 5.2 | 1.1 | 5.6 |
| Gallup | 28 Oct–1 Dec 2019 | 11,663 | 53.2 | 21.7 | 13.6 | 15.8 | 12.9 | 7.8 | 10.3 | 3.9 | 10.8 | 3.0 | – | 5.9 |
| MMR | 15–22 Nov 2019 | 1,061 | - | 18.1 | 10.6 | 13.2 | 16.8 | 9.4 | 10.8 | 6.3 | 9.7 | 3.0 | 2.2 | 1.3 |
| Gallup | 30 Sep–27 Oct 2019 | 9,798 | - | 22.7 | 13.4 | 17.3 | 11.5 | 8.2 | 9.0 | 4.6 | 10.3 | 2.6 | – | 5.4 |
| MMR | 21–25 Oct 2019 | 972 | - | 21.1 | 9.7 | 15.3 | 13.5 | 10.0 | 8.9 | 8.0 | 10.0 | 2.6 | 0.9 | 5.8 |
| Zenter | 10–14 Oct 2019 | 2,300 | 53 | 19.6 | 12.5 | 18.5 | 11.6 | 7.3 | 10.9 | 4.0 | 11.3 | 2.9 | 1.1 | 1.1 |
| MMR | 30 Sep–09 Oct 2019 | 2,124 | - | 19.8 | 10.3 | 14.1 | 14.8 | 10.1 | 8.8 | 5.6 | 11.0 | 3.1 | 2.4 | 5.0 |
| Gallup | 01–30 Sep 2019 | - | - | 23.5 | 12.0 | 16.1 | 12.3 | 7.9 | 9.7 | 4.3 | 11.2 | 2.7 | – | 7.4 |
| MMR | 09–16 Sep 2019 | 1,045 | - | 18.3 | 12.8 | 14.8 | 12.0 | 11.8 | 12.4 | 4.0 | 10.2 | 2.0 | 1.6 | 3.5 |
| Gallup | 29 Jul–01 Sep 2019 | 8,423 | 47.2 | 21.7 | 12.8 | 15.5 | 13.4 | 8.3 | 9.3 | 3.8 | 11.4 | 3.7 | - | 6.2 |
| MMR | 12–19 Aug 2019 | 990 | - | 19.1 | 11.5 | 16.8 | 13.0 | 10.4 | 11.3 | 4.1 | 9.3 | 2.9 | 1.6 | 2.3 |
| Gallup | 01–31 Jul 2019 | - | - | 21.6 | 12.0 | 13.7 | 12.1 | 8.5 | 12.7 | 3.7 | 12.2 | 3.2 | – | 7.9 |
| Zenter | 24–26 Jul 2019 | 2,000 | 45.0 | 20.5 | 12.9 | 14.4 | 13.4 | 8.2 | 12.3 | 3.2 | 10.6 | 2.7 | 1.9 | 6.1 |
| MMR | 04–17 Jul 2019 | 2,031 | - | 19.0 | 10.3 | 13.5 | 14.4 | 8.4 | 14.9 | 4.8 | 9.7 | 4.3 | 0.8 | 4.1 |
| Gallup | 31 May–30 Jun 2019 | 5,910 | 53.0 | 23.7 | 13.0 | 14.7 | 11.4 | 8.6 | 11.3 | 4.2 | 10.1 | 3.0 | – | 9.0 |
| MMR | 7–14 Jun 2019 | 988 | – | 22.1 | 11.3 | 14.4 | 10.6 | 7.7 | 14.4 | 4.2 | 9.5 | 4.4 | 1.3 | 7.7 |
| Gallup | 3–30 May 2019 | 6,125 | 53.5 | 23.4 | 12.4 | 16.6 | 10.0 | 8.5 | 11.2 | 3.2 | 10.9 | 3.7 | 0.1 | 6.8 |
| MMR | 23–29 May 2019 | 932 | – | 21.5 | 14.1 | 12.5 | 10.8 | 9.7 | 14.0 | 4.2 | 8.3 | 3.4 | 1.6 | 7.4 |
| MMR | 14–16 May 2019 | 978 | – | 21.3 | 12.2 | 13.9 | 11.8 | 11.6 | 9.8 | 6.4 | 8.4 | 3.2 | 1.4 | 7.4 |
| MMR | 30 Apr–3 May 2019 | 941 | – | 20.2 | 13.4 | 14.1 | 9.2 | 9.8 | 13.4 | 5.1 | 9.2 | 4.2 | 1.4 | 6.1 |
| Gallup | 5–30 Apr 2019 | 5,189 | 57.7 | 23.6 | 13.3 | 16.2 | 8.9 | 8.0 | 11.1 | 4.0 | 11.0 | 3.6 | 0.3 | 7.4 |
| MMR | 13 Apr 2019 | – | – | 22.5 | 12.1 | 14.3 | 9.2 | 11.2 | 13.3 | 5.0 | 7.8 | 2.8 | 1.7 | 8.2 |
| MMR | 4–9 Apr 2019 | 926 | – | 21.7 | 10.4 | 13.9 | 10.2 | 8.7 | 15.0 | 5.4 | 9.0 | 4.5 | 1.2 | 6.7 |
| Gallup | 1–31 Mar 2019 | 6,705 | 55.4 | 25.0 | 11.6 | 15.9 | 9.0 | 9.0 | 11.6 | 3.7 | 10.3 | 3.5 | 0.4 | 9.1 |
| MMR | 11–14 Mar 2019 | 1,025 | – | 23.6 | 11.4 | 13.8 | 8.0 | 11.1 | 13.6 | 4.7 | 9.4 | 2.5 | 1.9 | 9.8 |
| Gallup | 31 Jan–28 Feb 2019 | 7,060 | 53.5 | 25.0 | 12.3 | 16.8 | 6.7 | 9.0 | 11.6 | 3.4 | 9.9 | 5.0 | 0.3 | 8.2 |
| MMR | 11–15 Feb 2019 | 934 | – | 22.7 | 11.1 | 15.9 | 6.1 | 13.5 | 10.4 | 6.9 | 8.1 | 3.6 | 1.5 | 6.8 |
| Gallup | 7–31 Jan 2019 | 4,241 | 54.4 | 23.4 | 11.3 | 19.1 | 6.5 | 8.8 | 12.7 | 3.7 | 9.1 | 5.3 | 0.1 | 4.3 |
| MMR | 28 Jan 2019 | – | – | 21.8 | 12.2 | 15.5 | 8.3 | 12.6 | 12.0 | 5.4 | 9.2 | – | 3.1 | 6.3 |
| MMR | 4–14 Jan 2019 | 2,061 | – | 22.2 | 11.3 | 15.0 | 6.9 | 11.7 | 13.8 | 6.7 | 7.8 | – | 4.6 | 7.2 |
| Gallup | 3 Dec 2018–1 Jan 2019 | 4,899 | 58.0 | 22.7 | 11.6 | 18.4 | 5.7 | 11.4 | 10.7 | 5.3 | 10.5 | 3.4 | 0.3 | 4.3 |
| MMR | 5–11 Dec 2018 | 975 | – | 22.1 | 12.9 | 16.9 | 5.9 | 12.5 | 14.4 | 4.2 | 8.5 | – | 2.6 | 5.2 |
| Zenter | 3–4 Dec 2018 | 2,300 | 55 | 21.4 | 12.7 | 20.8 | 4.3 | 8.5 | 14.4 | 5.7 | 9.1 | – | 3.1 | 0.6 |
| Maskína | 30 Nov–3 Dec 2018 | 1,311 | – | 19.3 | 14.9 | 19.7 | 4.6 | 8.8 | 14.9 | 4.4 | 13.4 | – | – | 0.4 |
| Gallup | 3 Nov–2 Dec 2018 | 5,319 | 58.3 | 23.5 | 10.5 | 18.7 | 12.0 | 7.5 | 10.2 | 6.2 | 9.8 | 1.3 | 0.3 | 4.8 |
| MMR | 21 Nov 2018 | – | – | 21.1 | 10.3 | 16.3 | 13.1 | 7.5 | 11.3 | 7.6 | 8.6 | – | 4.2 | 4.8 |
| MMR | 8–12 Nov 2018 | 1,048 | – | 19.8 | 11.5 | 16.6 | 12.1 | 8.8 | 11.3 | 7.3 | 7.8 | – | 4.7 | 3.2 |
| Gallup | 2–31 Oct 2018 | 6,129 | 54.8 | 25.8 | 10.6 | 17.0 | 10.3 | 7.2 | 10.6 | 6.2 | 10.8 | 1.1 | 0.4 | 8.8 |
| MMR | 22 Oct 2018 | – | – | 20.8 | 10.8 | 16.5 | 12.8 | 7.8 | 13.2 | 5.9 | 9.9 | – | 2.3 | 4.3 |
| MMR | 3–9 Oct 2018 | 921 | – | 20.8 | 10.9 | 16.7 | 11.9 | 8.9 | 12.7 | 6.1 | 8.6 | – | 3.2 | 4.1 |
| Gallup | 3 Sep–1 Oct 2018 | 5,460 | 53.3 | 24.6 | 10.3 | 19.3 | 9.8 | 6.6 | 11.5 | 5.9 | 10.7 | 0.9 | 0.4 | 5.3 |
| MMR | 7–12 Sep 2018 | 953 | – | 21.3 | 11.1 | 19.8 | 10.8 | 8.1 | 13.2 | 5.3 | 7.9 | – | 2.5 | 1.5 |
| Gallup | 2 Aug–2 Sep 2018 | 7,094 | 52.6 | 22.7 | 11.7 | 19.3 | 8.7 | 8.2 | 12.5 | 5.7 | 10.1 | 0.7 | 0.4 | 3.4 |
| MMR | 10 Aug 2018 | – | – | 22.1 | 8.8 | 16.6 | 10.3 | 8.9 | 13.4 | 7.8 | 8.7 | – | 3.4 | 5.5 |
| Gallup | 29–30 Jul 2018 | 7,060 | 50.4 | 24.6 | 10.7 | 16.7 | 8.6 | 9.2 | 13.9 | 6.0 | 8.7 | 0.9 | 0.7 | 7.9 |
| Gallup | 31 May–1 Jul 2018 | 5,875 | 55.2 | 24.5 | 11.5 | 15.2 | 8.0 | 8.5 | 13.1 | 5.1 | 10.4 | 1.0 | 2.7 | 9.3 |
| MMR | 12–18 Jun 2018 | 925 | – | 21.6 | 12.7 | 15.1 | 10.6 | 9.5 | 14.3 | 8.2 | 5.8 | – | 2.2 | 6.5 |
| Gallup | 2–31 May 2018 | 7,113 | 56.6 | 23.8 | 13.3 | 17.9 | 8.5 | 8.9 | 13.3 | 4.1 | 8.4 | – | 1.8 | 5.9 |
| MMR | 16–22 May 2018 | 929 | – | 23.7 | 12.0 | 14.6 | 9.8 | 10.1 | 14.1 | 5.6 | 7.1 | – | 3.0 | 9.1 |
| MMR | 2 May 2018 | – | – | 24.5 | 13.7 | 14.7 | 10.3 | 8.2 | 13.0 | 5.8 | 7.6 | – | 2.1 | 9.8 |
| Gallup | 27 Mar–29 Apr 2018 | 6,766 | 56.3 | 25.3 | 14.1 | 17.7 | 7.9 | 9.6 | 11.0 | 4.2 | 7.7 | – | 2.5 | 7.6 |
| MMR | 13–19 Apr 2018 | 910 | – | 23.9 | 14.3 | 13.6 | 8.8 | 7.3 | 15.3 | 6.9 | 7.0 | – | 2.8 | 8.6 |
| Gallup | 1–26 Mar 2018 | 5,423 | 57.0 | 24.5 | 13.9 | 16.5 | 8.7 | 9.2 | 12.5 | 4.9 | 8.4 | – | 1.4 | 8.0 |
| MMR | 19 Mar 2018 | – | – | 25.3 | 14.8 | 16.1 | 10.7 | 9.0 | 13.2 | 3.6 | 6.0 | – | 1.4 | 9.2 |
| MMR | 12 Mar 2018 | – | – | 21.9 | 16.1 | 15.9 | 9.7 | 8.8 | 13.8 | 5.7 | 6.1 | – | 2.0 | 5.8 |
| Gallup | 1–28 Feb 2018 | 5,564 | 55.3 | 23.5 | 16.6 | 15.3 | 8.6 | 9.3 | 11.9 | 5.9 | 6.8 | – | 2.2 | 6.9 |
| Gallup | 4–31 Jan 2018 | 5,606 | 53.8 | 25.5 | 16.9 | 16.1 | 6.8 | 9.5 | 10.7 | 5.5 | 7.3 | – | 1.7 | 8.6 |
| MMR | 25–30 Jan 2018 | 928 | – | 22.3 | 18.4 | 14.9 | 7.7 | 11.2 | 12.9 | 4.2 | 6.0 | – | 2.4 | 3.9 |
| MMR | 9–17 Jan 2018 | 1,594 | – | 25.8 | 15.0 | 13.9 | 6.9 | 11.2 | 12.2 | 6.1 | 6.2 | – | 2.6 | 10.8 |
| Gallup | 30 Nov–28 Dec 2017 | 7,001 | 55.2 | 25.1 | 17.3 | 15.5 | 5.8 | 11.9 | 10.1 | 5.4 | 6.5 | – | 2.4 | 7.8 |
| MMR | 12–15 Dec 2017 | 923 | – | 23.2 | 16.7 | 16.8 | 8.7 | 8.5 | 14.1 | 3.7 | 5.7 | – | 2.5 | 6.4 |
| Fréttablaðið/Stöð 2/Vísir | 4 Dec 2017 | 804 | – | 26.4 | 23.5 | 13.4 | 7.4 | 11.3 | 7.7 | 4.0 | 4.8 | – | 1.5 | 2.9 |
| Gallup | 8–30 Nov 2017 | 3,991 | 57.8 | 24.0 | 16.1 | 16.7 | 6.8 | 10.4 | 10.4 | 6.4 | 7.1 | – | 2.1 | 7.3 |
| MMR | 14–17 Nov 2017 | 944 | – | 24.4 | 13.0 | 16.0 | 10.5 | 9.5 | 9.9 | 8.4 | 6.5 | – | 1.8 | 8.4 |
| 2017 parliamentary election | 28 Oct 2017 | – | – | 25.2 | 16.9 | 12.1 | 10.9 | 10.7 | 9.2 | 6.9 | 6.7 | – | 1.5 | 8.4 |