Tatjana Mannima (born 10 January 1980) is an Estonian cross-country skier. She represented Estonia in 2006, 2010 and 2018 Winter Olympics, she earned her best finish of 17th in the 4 × 5 km relay at Turin at 2006 while her best individual finish was 41st both in the individual sprint and 30 km events at those same games. Mannima's best finish at the FIS Nordic World Ski Championships was 15th twice in the 4 × 5 km relay (2007, 2009) while her best individual finish was 41st in the 30 km event at Liberec in 2009.