Mary Muhanji Kasango is a Kenyan High Court Judge who was appointed to the bench in 2003. She received her undergraduate education at the Middlesex University in London and was subsequently called to the Bar, at Lincoln’s Inn in England in 1979. On her return to Kenya, she was called to the Kenyan Bar after completing the Kenya School of Law. Prior to her call to the Bench, Mary worked as a part-time lecturer at the Kenya School of Law teaching Trust Accounts.

As an attorney, she had her own law firm under the name Muhanji-Kasango Advocates. Mary holds a Master of Laws in Intellectual Property Law from the Golden Gate University of Law. Her thesis focused on Kenya's encounter with the International Criminal Court (ICC) and discusses events surrounding Kenya’s 1963 independence, the country’s institutions before the 2007 general elections, and post 2007 elections. Thirteen years after her appointment to the Kenyan bench, Judge Mary Kasango was elected to the Common Market for Eastern and Southern Africa (COMESA) Court of Justice - First Instance Division.

Justice Mary Kasango’s judgment In the Matter of the Estate of M’mukindia M’ndegwa (deceased) is considered a positive judgment concerning succession by The Equal Rights Trust in their report addressing discrimination and inequality in Kenya. In 2019, she was listed as a recipient of the presidential award – the Moran of the Order of the Burning Spear (M.B.S.).