The East Coast boubou or Zanzibar boubou (Laniarius sublacteus) is a species of bird in the family Malaconotidae.

It is found from southeast Somalia to northeast Tanzania, and Zanzibar island.

Outer tail feathers may have white tips.

An all-black morph occurs in the area around the lower Jubba and Tana Rivers and on the Lamu Archipelago.

The species complex was split based on the results of a molecular phylogenetic study published in 2008.