Hitomi Niiya (新谷 仁美, Niiya Hitomi, born 26 February 1988) is a Japanese professional long-distance runner who competes in track, cross country running and marathon races. Niiya competed for Japan at the 2012 Summer Olympics. She is a two-time silver medallist at the Asian Athletics Championships and has represented Japan three times at the World Athletics Championships (2011, 2013, 2019). She represents Team Toyota Industries in national competition.