Silja Kosonen (born 16 December 2002) is a Finnish hammer thrower. She competed in the 2020 Summer Olympics. She won the World U20 Championship in Hammer Throw held in Nairobi, Kenya.
Competition record
| Year | Competition | Venue | Position | Event | Notes |
|---|
| Representing Finland |
|---|
| 2019 | European Youth Olympic Festival | Baku, Azerbaijan | | Hammer throw | 72.35 m |
| 2021 | European U20 Championships | Tallinn, Estonia | | Hammer throw | 71.06 m |
| Olympic Games | Tokyo, Japan | 14th (q) | Hammer throw | 70.49 m |
| World U20 Championships | Nairobi, Kenya | | Hammer throw | 71.64 m |
| 2022 | World Championships | Eugene, United States | 7th | Hammer throw | 70.81 m |
| European Championships | Munich, Germany | 5th | Hammer throw | 69.45 m |
| 2023 | European U23 Championships | Espoo, Finland | 1st | Hammer throw | 73.71 m |
| World Championships | Budapest, Hungary | 5th | Hammer throw | 73.89 m |
| 2024 | European Championships | Rome, Italy | 4th | Hammer throw | 72.06 m |
| Olympic Games | Paris, France | 5th | Hammer throw | 74.04 m |
