Aubrey "Postman" Modiba (born 22 July 1995) is a South African professional soccer player who plays as a left-midfielder and left-back for Mamelodi Sundowns in the Premier Soccer League and South Africa national team.

Modiba began his professional soccer career at 19 years old representing Mpumalanga Black Aces in the 2014–15 PSL season.

In 2016, he was signed by Cape Town City after the relocation of Aces.

Modiba currently plays for the South Africa national U23 team as a midfielder.

In 2016, Modiba was selected to represent South Africa at the 2016 Summer Olympics in Rio de Janeiro.