João Olavo Soares de Souza (Portuguese pronunciation: [ʒuˈɐ̃w ˈso(w)zɐ]; born 27 May 1988) is a Brazilian former professional tennis player.

Before receiving a lifetime ban for match-fixing, Souza competed mainly on the ATP Challenger Tour, both in singles and doubles.

In 2015, he played in the longest singles match in Davis Cup history, losing to Leonardo Mayer in 6 hours and 42 minutes, 6–7(4), 6–7(5), 7–5, 7–5, 13–15.

In 2016, he won the 2016 International Tennis Tournament of Cortina on the ATP Challenger Tour, beating Laslo Djere in the final in straight sets.

In January 2020, the Tennis Integrity Unit announced that Souza had been issued a lifetime ban after conviction on match-fixing charges.