Cassin's Flycatcher or Cassin's Alseonax (Muscicapa cassini) is a species of bird in the Muscicapidae family. It is found in Angola, Benin, Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Ivory Coast, Equatorial Guinea, Gabon, Ghana, Guinea, Liberia, Niger, Nigeria, Rwanda, Sierra Leone, Togo, Uganda, and Zambia. Its natural habitat is subtropical or tropical swamps.