Sinel is a surname. Notable people with this name include:
João José Sinel de Cordes (1867–1930), Portuguese general and politician Rui Sinel de Cordes (born 1980), Portuguese author, comedian and television host Joseph Claude Sinel (1889–1975), New-Zealand-born American industrial designer Joseph Sinel (1844–1929), naturalist and archaeologist Ray Sinel, New Zealand rugby league footballer
See also Sinel River, the right tributary of the river Someș in Romania