Louis Antoine Marie Joseph Dollo (French pronunciation: [lwi ɑ̃twan maʁi ʒozɛf dɔlo]; Lille, 7 December 1857 – Brussels, 19 April 1931) was a Belgian palaeontologist, known for his work on dinosaurs.

He studied at the École centrale de Lille, with geologist Jules Gosselet and zoologist Alfred Giard, both of whom influenced the young Dollo.

From 1882 to 1885, while he was head of the vertebrate fossil section of the Royal Institute, Dollo worked on reconstructing the skeletons of the iguanodons, as it was necessary to display them on their hind legs.

Dollo collaborated with his former professor Alfred Giard and the Université Lille Nord de France.

This hypothesis was largely accepted until Michael F. Whiting's 2003 discovery that certain insects that had lost their wings regained them millions of years later.