Deng Cypriano Rehan is a South Sudanese chess player.
In 2017, Rehan defeated Haruna Nsubuga in the third round and top-seeded player Arthur Ssegwanyi in the fourth round of the Uganda Open Chess Championship.
In 2018, Rehan captained the South Sudan team in the 43rd Chess Olympiad, where they won a gold medal in Group E.
Rehan participated in the 44th Chess Olympiad in 2022, though the team lost to the India-C team.
Rehan competed in the Chess World Cup 2023, where he was defeated by Javokhir Sindarov in the first round.