| Clubname: | C.U. Idanhense |
| Fullname: | Clube União Idanhense |
| Founded: | 1917[1] |
| Ground: | Estádio Municipal de Idanha-a-Nova, Idanha-a-Nova[2] |
| Capacity: | 3,000 |
| League: | Portuguese District Championships |
| Position: | Campeonato de Portugal, relegated |
| Pattern La1: | _cdsw18h |
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| Body1: | 66DECE |
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| Socks1: | 0C3433 |
| Pattern La2: | _sporting1819a |
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Clube União Idanhense is a Portuguese sports club from Idanha-a-Nova.
The men's football team plays in the Portuguese District Championships, the fifth tier of Portuguese football. The team was promoted to the fourth-tier Campeonato de Portugal league after winning the 2020–21 I Divisão AF Castelo Branco, but was relegated after just one season. The team enjoyed spells on the old fourth tier, the Terceira Divisão, in 1999–2000 and 2003 to 2007.[1]