Octávio Mateus is a Portuguese paleontologist, specializing in dinosaurs from the Late Jurassic of Portugal.
Octávio got a degree in Biology from the Universidade de Évora in Portugal in 1998, and his PhD from the Universidade Nova de Lisboa in 2005. He currently works for the Universidade Nova de Lisboa in Portugal, teaching Portugal's first paleontology program. He also works with the Museum of the Lourinhã.
His parents were the founders of the Museum of the Lourinhã, and they took him on fossil hunting expeditions while he was growing up. He has worked in a number of countries: the United States, Brazil, Greenland, Laos, Tunisia, Mozambique, Mongolia, Morocco, South Africa, and Angola.
He has discovered or described a number of dinosaurs, including the first dinosaur from Angola, Angolatitan.