# List of first class roads in Slovakia

The list of Class I roads in Slovakia contains an overview of all communications that are categorized as Class I roads.
| Route name | Route | Length [km] |
| I/2 | Holíč – Malacky – Bratislava – Hungarian border at Rusovce | 100 |
| I/9 | Czech border at Drietoma – Trenčín – Prievidza – Žiar nad Hronom Former portion of I/50 | 114 |
| I/10 | Czech border at Bumbálka – Bytča | 30 |
| I/11 | Czech border at Svrčinovec – Čadca – Žilina | 37 |
| I/11A | Čadca bypass Portion of D3 motorway | 5 |
| I/11b | Čadca | 1 |
| I/12 | Svrčinovec – Polish border at Skalité | 15 |
| I/13 | Veľký Meder – Hungarian border at Medveďov | 12 |
| I/14 | Banská Bystrica – Turčianske Teplice | 22 |
| I/15 | Vranov nad Topľou – Stropkov | 49 |
| I/16 | Zvolen – Lučenec – Rožňava – Košice Former portion of I/50 | 197 |
| I/17 | Hungarian border at Milhosť – Košice Former portion of I/68 | 18 |
| I/18 | Žilina – Vrútky – Ružomberok – Poprad – Prešov – Vranov nad Topľou – Michalovce Originally began at Bumbálka, but this section became the new I/10, a portion of the current I/61 and the new I/60 in 2015. | 304 |
| I/19 | Košice – Michalovce – Ukrainian border at Vyšné Nemecké Former portion of I/50 | 90 |
| I/20 | Košice – Prešov Former portion of I/68 | 24 |
| I/21 | Lipníky – Svidník – Polish border at Vyšný Komárnik | 59 |
| I/35 | Galanta – Sereď | 8 |
| I/49 | Czech border at Lysá pod Makytou – Púchov – Beluša | 27 |
| I/49A | Dolné Kočkovce – Púchov Portion of R6 expressway | 5 |
| I/50 | Czech border at Drietoma – Ukrainian border at Vyšné Nemecké Decommissioned on 1 August 2015. The Drietoma–Ladomerská Vieska section became the new I/9, the Ladomerská Vieska–Šášovské Podhradie section became a portion of current I/65, the Zvolen–Košice section became the new I/16, and the Košice–Vyšné Nemecké section became the new I/19. | 403 |
| I/51 | Czech border at Holíč – Trnava ; Nitra – Hontianske Nemce – Banská Štiavnica – Hronská Breznica | 200 |
| I/54 | Czech border at Moravské Lieskové – Nové Mesto nad Váhom | 16 |
| I/57 | Czech border at Horné Srnie – Dubnica nad Váhom | 12 |
| I/59 | Banská Bystrica – Ružomberok – Dolný Kubín – Polish border at Trstená | 114 |
| I/60 | Žilina ring road | 6.5 |
| I/61 | Austrian border west of Bratislava – Bratislava – Senec – Trnava – Piešťany – Nové Mesto nad Váhom – Trenčín – Považská Bystrica – Žilina | 191 |
| I/61A | Beluša | 2 |
| I/62 | Senec – Sereď – Šoporňa | 37 |
| I/63 | Bratislava – Dunajská Streda – Komárno – Štúrovo – Hungarian border | 148 |
| I/64 | Hungarian border – Komárno – Nové Zámky – Nitra – Prievidza – Žilina | 213 |
| I/64A | Rajeckých Teplíc bypass | 1 |
| I/64b | Bytčica | |
| I/64C | Road I/64 – Road I/64b | |
| I/64d | Topoľčiani – Krušovice | |
| I/65 | Nitra – Zlaté Moravce – Čaradice ; Hronský Beňadik – Nová Baňa; Žarnovica – Žiar nad Hronom – Turčianske Teplice – Martin – Vrútky | 125 |
| I/65D | Martin bypass | 7 |
| I/66 | Hungarian border at Šahy – Zvolen – Banská Bystrica – Brezno – Vernár – Poprad – Spišská Belá – Polish border at Tatranská Javorina | 244 |
| I/66A | Poprad bypass | 3.64 |
| I/67 | Hungarian border at Kráľ – Tornaľa ; Rožňava – Pusté Pole Originally continued to Tatranská Javorina, but this (along with I/67A) became a portion of I/66 in 2015. | 61 |
| I/68 | Polish border at Mníšek nad Popradom – Stará Ľubovňa – Prešov Originally continued to the Hungarian border at Milhosť, but this section was split off to the new I/17 and I/20 in 2015. | 80 |
| I/69 | Kováčová – Banská Bystrica | 13 |
| I/70 | Párnica – Dolný Kubín | 18 |
| I/71 | Lučenec – Hungarian border at Šiatorská Bukovinka | 26 |
| I/72 | Rimavská Sobota – Brezno ; Podbrezová – Liptovský Hrádok | 105 |
| I/73 | Lipníky – Svidník – Polish border at Vyšný Komárnik Decommissioned on 1 August 2015 and renumbered to I/21. | 59 |
| I/74 | Strážske – Humenné – Ukrainian border at Ubľa | 60 |
| I/74A | Humenné inner bypass | 3 |
| I/74B | Humenné inner bypass | 0.1 |
| I/75 | Sládkovičovo – Galanta – Šaľa – Nové Zámky – Veľký Krtíš – Lučenec | 200 |
| I/75A | Galanta bypass | 9 |
| I/76 | Štúrovo – Hronský Beňadik | 75 |
| I/77 | Spišská Belá – Stará Ľubovňa – Bardejov – Svidník | 115 |
| I/77A | Čirč – Polish border | 0.1 |
| I/78 | Oravský Podzámok – Námestovo – Polish border at Oravská Polhora | 44 |
| I/79 | Vranov nad Topľou – Trebišov – Slovenské Nové Mesto – Čierna | 90 |
| I/79A | Slovenské Nové Mesto – Hungarian border | 0.4 |
| I/80 | I/68 in Presov – D1 motorway in Presov Decommissioned on 1 October 2020 and absorbed into I/68. | 1.8 |