# 2021 World Athletics U20 Championships – Women's 800 metres

The women's 800 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium from 19 to 21 August.

## Records

Standing records prior to the 2021 World Athletics U20 Championships :
| World U20 Record | Pamela Jelimo (KEN) | 1:54.01 | Zürich, Switzerland | 29 August 2008 |
| Championship Record | Diribe Welteji (ETH) | 1:59.74 | Tampere, Finland | 12 July 2018 |
| World U20 Leading | Athing Mu (USA) | 1:55.21 | Tokyo, Japan | 3 August 2021 |

## Results
### Heats

Qualification: First 3 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 3 | Ayal Dagnachew | Ethiopia | 2:02.94 | Q, PB |
| 2 | 1 | Elli Eftychia Deligianni | Greece | 2:05.38 | Q |
| 3 | 3 | Zita Urbán | Hungary | 2:07.39 | Q, PB |
| 4 | 1 | Svitlana Zhulzhyk | Ukraine | 2:07.61 | Q |
| 5 | 4 | Avery Pearson | Canada | 2:07.99 | Q |
| 6 | 2 | Marina Martínez | Spain | 2:08.21 | Q |
| 7 | 2 | Veronika Sadek | Slovenia | 2:08.34 | Q |
| 8 | 1 | Mebriht Mekonen | Ethiopia | 2:08.62 | Q |
| 9 | 3 | Valentina Rosamilia | Switzerland | 2:08.89 | Q |
| 10 | 3 | Petja Klojčnik | Slovenia | 2:09.11 | q |
| 11 | 2 | Gabriella Szabó | Hungary | 2:09.39 | q |
| 12 | 2 | Annelies Nijssen | Belgium | 2:09.44 | Q |
| 13 | 2 | Lorena Rangel | Mexico | 2:09.86 | Q |
| 14 | 4 | Pavla Štoudková | Czech Republic | 2:10.27 | q |
| 15 | 3 | Federica Pansini | Italy | 2:10.34 | q |
| 16 | 4 | Pooja | India | 2:10.66 | |
| 17 | 1 | Tharushi Dissanayaka | Sri Lanka | 2:10.70 | Q |
| 18 | 2 | Aviwe Hoboloshe | South Africa | 2:11.65 | |
| 19 | 1 | Dunja Sikima | Serbia | 2:12.04 | |
| 20 | 4 | Brenda Chebet | Kenya | 2:12.16 | |
| 21 | 4 | Sebah Amar | Eritrea | 2:13.28 | |
| 22 | 1 | Shanika Kahawalage | Sri Lanka | 2:20.37 | |
| 23 | 4 | Chamsiya Yahaya | Niger | 2:31.55 | PB |
| 24 | 2 | Larisa Talpiș | Romania | 2:38.33 | |
| 25 | 3 | Alice Ilam Samuel | ART | 2:43.76 | PB |
| | 4 | Sheila Chepkosgei | Kenya | DQ | TR17.3.1 |
| | 3 | Daily Cooper | Cuba | DQ | TR17.3.1 |
| | 4 | Aster Yibabie | Eritrea | DQ | TR17.5 |
| | 3 | Perina Togo | South Sudan | DQ | TR17.3.1 |

### Semifinals

Qualification: First 3 of each heat (Q) and the 2 fastest times (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 1 | Ayal Dagnachew | Ethiopia | 2:04.26 | Q |
| 2 | 1 | Svitlana Zhulzhyk | Ukraine | 2:06.28 | Q |
| 3 | 1 | Elli Eftychia Deligianni | Greece | 2:06.41 | Q |
| 4 | 1 | Annelies Nijssen | Belgium | 2:07.13 | q |
| 5 | 2 | Marina Martínez | Spain | 2:07.22 | Q |
| 6 | 2 | Valentina Rosamilia | Switzerland | 2:07.23 | Q |
| 7 | 2 | Veronika Sadek | Slovenia | 2:07.41 | Q |
| 8 | 1 | Avery Pearson | Canada | 2:07.46 | q |
| 9 | 2 | Mebriht Mekonen | Ethiopia | 2:07.53 | |
| 10 | 1 | Gabriella Szabó | Hungary | 2:08.05 | |
| 11 | 2 | Zita Urbán | Hungary | 2:08.46 | |
| 12 | 1 | Federica Pansini | Italy | 2:08.83 | |
| 13 | 2 | Pavla Štoudková | Czech Republic | 2:09.14 | |
| 14 | 1 | Petja Klojčnik | Slovenia | 2:09.97 | |
| 15 | 2 | Lorena Rangel | Mexico | 2:10.08 | |
| 16 | 2 | Tharushi Dissanayaka | Sri Lanka | 2:17.82 | |

### Final

The final was held on 21 August at 16:46.
| Rank | Lane | Name | Nationality | Time | Note |
| | 6 | Ayal Dagnachew | Ethiopia | 2:02.96 | |
| | 4 | Valentina Rosamilia | Switzerland | 2:04.29 | |
| | 8 | Elli Eftychia Deligianni | Greece | 2:04.66 | |
| 4 | 2 | Veronika Sadek | Slovenia | 2:04.96 | PB |
| 5 | 3 | Svitlana Zhulzhyk | Ukraine | 2:06.04 | |
| 6 | 5 | Marina Martínez | Spain | 2:06.42(.414) | |
| 7 | 1 | Avery Pearson | Canada | 2:06.42(.415) | PB |
| 8 | 7 | Annelies Nijssen | Belgium | 2:09.55 | |