Sire Ma or Ma Choi is a Chinese actress and beauty pageant titleholder. Her birth name is Sima Saier (司马赛儿). She was the 2nd runner up at the Miss Hong Kong Pageant 2008, simultaneously winning the Miss Photogenic Award. She later went on to participate in the Miss International 2008, but was unplaced. She graduated from Hong Kong Baptist University. She left TVB around 2015 but remains active in mainland China in small roles on television and film.