Deon Joubert (born June 1953[note 1]) is a former professional tennis player from South Africa.

Joubert represented South Africa in the 1973 Davis Cup, for a tie against Argentina which was held in Montevideo, Uruguay.

That win kept South Africa in the tie and Joubert was called up to play Vilas in the fourth rubber, but was comfortably beaten by the Argentine.

[1] A left-handed player, Joubert competed in the 1973 Wimbledon Championships as a lucky loser and managed to make it to the third round, with wins over Colin Dowdeswell and Jaime Pinto-Bravo.

[2] In the third round he lost to Davis Cup teammate Bernard Mitton, also a lucky loser, in a five set match.