Seina Nakajima (中嶋星奈, Nakajima Seina, born December 2, 1997 in Karuizawa) is a Japanese curler from Nagano. She is the third on the Chubu Electric Power curling team, which won the Japan Curling Championships in both 2017 and 2019. At the international level, she has represented Japan twice at the World Women's Curling Championship (2019, 2022) and the 2019 Pacific-Asia Curling Championships, where she won a silver medal.