Rey Mark G. "Mac" Belo (born February 12, 1993)[1] is a Filipino professional basketball player who plays for the Zamboanga Valientes of The Asian Tournament (TAT).

[2] He attended St. Mary's Academy of Midsayap for his high school education and later entered the Far Eastern University for his collegiate studies.

[1] He was known for his buzzer beating 3-point winning shot against the De La Salle Green Archers in UAAP Season 77 that brought the FEU Tamaraws back to the finals for the first time since 2011 but eventually lost in 3 games to the NU Bulldogs.

[4] In UAAP Season 78, he was known for his second buzzer beating winning shot against the Ateneo Blue Eagles 76- 74 that brought FEU back to the finals for the second straight year.

[7] Belo decided to skip UAAP Season 79 on his last year with FEU to focus with his career with the Philippines national basketball team.

With Phoenix, Belo led his team to the finals of the 2016 PBA D-League Aspirant's Cup and was named MVP of the tournament.

[19][20] The Elite were able to qualify for the Governor's Cup playoffs that season with the 5th seed, but lost to Magnolia in the first round.

[36] On May 18, 2023, Belo's playing rights was traded to the Rain or Shine Elasto Painters for Norbert Torres.

He could have been a part of the Gilas roster for the 2017 SEABA Championship if not for a meniscus tear on his left knee.