The Olivaceous Flycatcher or Olivaceous Alseonax (Muscicapa olivascens) is a species of bird in the Muscicapidae family. It is found in Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Ivory Coast, Equatorial Guinea, Gabon, Ghana, Guinea, Liberia, Nigeria, and Sierra Leone. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical swamps.