Nicolai Budkov Kjær (born 1 September 2006) is a Norwegian professional tennis player.

Nicolai Budkov Kjær was born to a Norwegian father and an Estonian mother.

[5][6][7] He also won the 2024 French Open boys' doubles title alongside Joel Schwärzler, also the first for a Norwegian.

[9] In February 2024, he replaced Dominic Thiem at the Ultimate Tennis Showdown in Oslo, the ninth edition of the tournament.

[2] In November 2024, Budkov Kjær defeated former Top 10 player Pablo Carreño Busta at the 2024 Montemar Challenger.