| Award | Year | Category | Nominee / Work | Result | Ref. |
| A-Awards | 2022 | A-Awards – Confidence | Business Proposal | Won | |
| APAN Star Awards | 2021 | Best New Actor | Dr. Romantic 2 | Nominated | |
| 2022 | Excellence Award, Actor in a Miniseries | Lovers of the Red SkyBusiness Proposal | Nominated | |
| Popularity Star Award, Actor | Lovers of the Red Sky | Nominated | |
| Best Couple Award | Business Proposal (with Kim Se-jeong) | Nominated |
| Asia Artist Awards | 2017 | Rookie Award | My Father is Strange | Won | |
| 2019 | Choice Award | Ahn Hyo-seop | Won | |
| 2020 | Best Actor Award | Dr. Romantic 2 | Won | |
| Popularity Award (Actor) | Ahn Hyo-seop | Nominated | |
| 2022 | Nominated | |
| 2023 | Best Actor Award | Won | |
| Hot Trend Award | Won | |
| Baeksang Arts Awards | 2020 | Best New Actor – Television | Dr. Romantic 2 | Won | |
| Blue Dragon Film Awards | 2025 | Best New Actor | Omniscient Reader: The Prophecy | Nominated | |
| Korea Drama Awards | 2019 | Best New Actor | Abyss | Nominated | |
| Korea First Brand Awards | 2024 | Male Actor (Vietnam Category) | Ahn Hyo-seop | Won | |
| MBC Drama Awards | 2016 | Best New Actor | Happy Home | Nominated | |
| SBS Drama Awards | 2018 | Best New Actor | Still 17 | Won | |
| Character of the Year | Nominated |
| 2020 | Excellence Award, Actor in a Miniseries Action/Genre Drama | Dr. Romantic 2 | Won | |
| Best Couple Award | Dr. Romantic 2 (with Lee Sung-kyung) | Nominated | |
| 2021 | Excellence Award, Actor in a Miniseries Genre/Fantasy Drama | Lovers of the Red Sky | Won | |
| Best Couple Award | Lovers of the Red Sky (with Kim Yoo-jung) | Won | |
| 2022 | Business Proposal (with Kim Se-jeong) | Won | |
| Top Excellence Award, Actor in a Miniseries Romance/Comedy Drama | Business Proposal | Won | |
| 2023 | Top Excellence Award, Actor in a Seasonal Drama | Dr. Romantic 3 | Won | |
| Best Supporting Team | Won |
| Best Couple Award | Dr. Romantic 3(with Lee Sung-kyung) | Nominated | |