Monika Gabriela Müller-Sep (born 22 February 1986) is a Swiss chess player, Woman Grandmaster (2014), five time Swiss Women's Chess Championship winner (2001, 2002, 2005, 2007, 2012).

She also played for chess clubs Luzern SK and SG Winterthur.

Monika Müller-Seps played for Switzerland in the Women's Chess Olympiads:[2] Monika Müller-Seps played for Switzerland in the European Women's Team Chess Championships:[5] In 2006, she was awarded the FIDE Women International Master (WIM) title and received the FIDE Women Grandmaster (WGM) title eight years later.

She achieved the highest Elo rating in her career so far on October 1, 2007, with a score of 2290 points, she was then ranked first among Swiss female chess players.

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