Omar Kalinge Nnyago was born in Lusera Village, Kitale Parish, Namuganga sub-county, Nakifuma County in Mukono district. He studied at Kitale Primary School, Kibuli Secondary School before going to Makerere University where he studied a degree in electrical engineering. He also has a Master of Science Degree (Management Information Systems).
Kalinge has been in politics since 1995 when he served as the national campaign coordinator for presidential candidate Mohammed Kibirige Mayanja in the 1996 presidential elections. He also held the same role in 2001 when Mayanja contested again.
He was instrumental in the formation of the Justice Forum (JEEMA), where he has been its spokesperson form 2005 to 2010.
He has also been the deputy secretary general of the party until July 19, 2015, when he resigned.
He served as the media content advisor at the Elect Kizza Besigye Presidential campaign Bureau 2011.
He has been the head of JEEMA delegation in the Inter Party Organisation for Dialogue (IPOD).
He is married with children.