Kasper Halttunen (born 7 June 2005) is a Finnish professional ice hockey player for the San Jose Barracuda in the American Hockey League (AHL) as a prospect under contract to the San Jose Sharks of the National Hockey League (NHL). Halttunen was drafted 36th overall by the Sharks in the second round of the 2023 NHL entry draft.
After participating in the San Jose Sharks' training camp, Halttunen was assigned to play with San Jose's AHL affiliate, the San Jose Barracuda, to begin the 2024–25 season. He had four points in six games before being sent back to the OHL for the remainder of the season. The London Knights won their second consecutive Robertson Cup, with Halttunen recording 21 points. He scored nine goals in the championship series against the Oshawa Generals, the most for an OHL player in the playoff finals since Jonathan Cheechoo in 1999. In recognition of this, Halttunen received the Wayne Gretzky 99 Award as the most valuable player of the postseason. The Knights went on to compete at the 2025 Memorial Cup, ultimately defeating the Medicine Hat Tigers for the title.
| 2021–22 | Jokerit | U20 | 75 | 25 |
| 2022–23 | HIFK Hockey | U20 | 14 | 0 |
| 2022–23 | HIFK | Liiga | 8 | 0 |
| 2022–23 | Kiekko-Vantaa | Mestis | 2 | 4 |
| 2023–24 | London Knights | OHL | 61 | 14 |
| 2024–25 | San Jose Barracuda | AHL | 2 | — |
| 2024–25 | London Knights | OHL | 38 | 18 |
| 2021 | Finland | HG18 | 4th | 6 |
| 2022 | Finland | U18 | 0 | |
| 2022 | Finland | HG18 | 4 | |
| 2023 | Finland | U18 | 5th | 6 |
| 2024 | Finland | WJC | 4th | 4 |
| 2025 | Finland | WJC | 6 | |
| Memorial Cup All-Star Team | 2024 | |
| Memorial Cup champion | 2025 | |
| J. Ross Robertson Cup champion | 2024, 2025 | |
| Wayne Gretzky 99 Award | 2025 |
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