The Melbourne High School Old Boys Football Club (MHSOB), nicknamed the Unicorns, is an Australian rules football club based in the Melbourne suburb of South Yarra.

In addition to football, MHSOBA also has cricket and field hockey clubs.

[1][2] As of 2024, MHSOB competes in Division 2 of the Victorian Amateur Football Association (VAFA).

The team's founding in August 1907 was an unofficial game between the club and the school.

The school side won by 58 points, but the Old Boys returned the next year to play the match again.