Clube Futebol Os Marialvas is a Portuguese sports club from Cantanhede.
The men's football team plays in the Honra B AF Coimbra. The team played on the second tier of Portuguese football until the 1989–90 Segunda Divisao, then the 1990–91 Segunda Divisao B followed by a stint in the Terceira Divisao until 1998–99. Another stint in the Terceira Divisao was confined to the 2005–06 edition. In the Taca de Portugal, Marialvas among others reached the fourth round in the 1992–93 edition.