Sarina Koga (古賀 紗理那, Koga Sarina, born May 21, 1996) is a Japanese volleyball player who won the bronze medal at the 2013 U23 World Championship with Japan's U23 national team.

[3][4] Koga played for the senior national team for the first time at the Alassio Cup in May 2013.

[6] In October 2013, Koga competed in the 2013 FIVB Women's U23 Volleyball World Championship and won the bronze medal.

She announced on 8 July 2024 through social media that the 2024 Paris Olympics will be her final tournament with Japan.

On 31 December 2022, Koga announced her marriage to the Japan Men's Volleyball Team Opposite Hitter, Yuji Nishida.