Seiya Da Costa Lay (; born 30 September 2001) is an Indonesian professional footballer who plays as a defensive midfielder.
Born to Indonesian father, from East Nusa Tenggara, and Japanese mother, Da Costa lived in Japan before moving to Indonesia.
Da Costa was signed for Arema to play in Liga 1 in the 2021 season. Seiya made his debut on 11 December 2022 as a substitute in a match against Persis Solo at the Jatidiri Stadium, Semarang.