Justinian Tamusuza (born 1951) is a Ugandan composer of contemporary classical music. His music combines elements of traditional Ugandan music and Western music. He is best known for his first string quartet, which was included by the Kronos Quartet on their 1992 CD Pieces of Africa, which contains music by seven African composers. His music has also been performed by the Imani Winds. He has taught at Makerere University in Kampala, Uganda, as well as at Northwestern University. His music is published by International Opus.