| Giannis Niarchos | |
| Fullname: | Ioannis Niarchos |
| Birth Date: | 26 June 2002 |
| Birth Place: | Athens, Greece |
| Height: | 1.88 m |
| Currentclub: | FC Košice (on loan from DAC Dunajská Streda) |
| Clubnumber: | ― |
| Position: | Striker |
| Youthyears1: | 2013–2020 |
| Youthclubs1: | Panathinaikos |
| Youthyears2: | 2020 |
| Youthclubs2: | Senica |
| Years1: | 2020–2022 |
| Clubs1: | Senica |
| Caps1: | 33 |
| Goals1: | 4 |
| Years2: | 2022 |
| Caps2: | 16 |
| Goals2: | 5 |
| Years3: | 2023– |
| Caps3: | 22 |
| Goals3: | 0 |
| Years4: | 2024 |
| Clubs4: | → Michalovce (loan) |
| Caps4: | 14 |
| Goals4: | 2 |
| Years5: | 2024– |
| Caps5: | 0 |
| Goals5: | 0 |
| Nationalyears1: | 2017 |
| Nationalcaps1: | 3 |
| Nationalgoals1: | 0 |
| Nationalyears2: | 2023– |
| Nationalcaps2: | 8 |
| Nationalgoals2: | 1 |
| Pcupdate: | 19 July 2024 |
| Ntupdate: | 21:00, 10 September 2024 (UTC) |
Giannis Niarchos (el|Γιάννης Νιάρχος|Yannis Niarchos; born 26 June 2002) is a Greek professional footballer who plays as a striker for Slovak Fortuna Liga club FC Košice on loan from DAC Dunajská Streda.
On 19 July 2024 FC Košice acquired Niarchos on one-year loan, from DAC Dunajská Streda, with option to buy.[1]