Sire Ma (simplified Chinese: 马赛; traditional Chinese: 馬賽; pinyin: Mǎ Sài; born 31 July 1987), or Ma Choi, is a Chinese actress based in Hong Kong. Her birth name is Sima Saier (simplified Chinese: 司马赛儿; traditional Chinese: 司馬賽兒; pinyin: Sīmǎ Sài-er; Jyutping: Si1maa5 Coi3ji4). 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.