União Sport Clube is a Portuguese sports club from Santiago do Cacém.

The men's football team plays in the I AF Setúbal.

[1] The team played on the third-tier Segunda Divisão B in the first half of the 1990s.

In the Taça de Portugal, União Santiago notably reached the fourth round in the 1992–93 and third round in 2018–19.

This article about a Portuguese football club is a stub.