William Lutley Sclater (23 September 1863 – 4 July 1944) was a British zoologist and museum director. He was the son of Philip Lutley Sclater and was named after his paternal grandfather, also William Lutley Sclater. From 1909 Sclater became curator of the Bird Room at the Natural History Museum. While working there he compiled the Systema Avium Aethiopicarum (1924 - 1930), a scholarly work that assisted further research. He worked there until his death in 1944.