The São Tomé fiscal (Lanius newtoni), or Newton's fiscal, is a species of bird in the family Laniidae. It is endemic to São Tomé Island, São Tomé and Príncipe. It is 20 to 21 centimeters long. The bird is black above with a white shoulder-scapular bar. The São Tomé fiscal has a pale yellow chin, breast, belly, flanks vent and under tail. Its graduated tail has all black central tail feathers and an increasing amount of white on outer web from inner to outer tail feathers. The Lanius newtoni has a clear voice with a whistle tiuh tiuh often repeated and metallic tsink tsink audible over a long distance.