Daniil Ostapenkov (born May 8, 2003) is a Belarusian professional tennis player.

Ostapenkov is best known for his shocking upset win, in straight sets, over world No.

8 Diego Schwartzman during a Davis Cup match against Argentina.

On April 29, 2024, Daniil became an ambassador for the IT company BackHandStats, which specializes in the implementation and development of technologies in the field of tennis.

This biographical article relating to Belarusian tennis is a stub.