Joel Dias Barcellos, better known as Joel Barcelos (Vitória, November 27, 1936 – Rio das Ostras, November 10, 2018), was a Brazilian actor, having also worked as a screenwriter and director. In some films, he was credited as Joel Martins.

He was a very active actor in New Cinema, especially in the 1960s. He received the Candango Award for Best Actor at the Brasília Festival for his performance in Jardim de Guerra, in 1968. He was also elected 'Best Supporting Actor' by the same award when acting in Kiss 2348/72. Despite preferring cinema, he also played roles on television, mainly in miniseries.