Sociedade União 1º Dezembro is a sports club from Sintra, Portugal.

The women's football team played in the national top league, the Campeonato Nacional and dominated till the 2010s.

[2] In the UEFA Women's Cup they did not go past the 1st qualification round.

In the 2009–10 and 2010–11 Women's Champions League they competed in the qualifying round.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.