Porto Dinheiro (or Praia de Porto Dinheiro) is a locality in the county (freguesia) of Ribamar, municipality of Lourinhã, in Portugal. Is known as a rich fossil locality, from where were found many Late Jurassic dinosaurs and mammals. A few even received the locality name, like the Dinheirosaurus lourinhanensis and Jurassic mammals like Portopinheirodon asymmetricus. The second one is the based for a new family of mammals, the Portopinheirodontidae. This locality was once considered to be early Cretaceous in age, but it is Tithonian (Late Jurassic).