Masahiro Sekita (関田 誠大, Sekita Masahiro, born 20 November 1993) is a Japanese male professional volleyball player from Tokyo. He currently plays in V.League Division 1 for JTEKT Stings and Japan men's national volleyball team. He used to be the captain of Japan U-21 national team in 2012 Asian Junior Men's Volleyball Championship and 2013 FIVB Volleyball Men's U21 World Championship.