Longfellow-Evangeline State Historic Site (French: Site historique d'État Longfellow-Evangeline), located in St. Martinville, Louisiana, showcases the cultural significance of the Bayou Teche region.

Evangeline was Henry Wadsworth Longfellow's enormously popular 1847 epic poem about Acadian lovers, who are now figures in local history.

A statue of Evangeline marks her supposed grave next to St. Martin of Tours Church.

Several historic buildings are showcased at Longfellow-Evangeline State Historic Site, which cover 157 acres (0.64 km2): Maison Olivier, designated a National Historic Landmark (as Acadian House) in 1974, is a plantation home built c. 1815 by Pierre Olivier Duclozel de Vezin, a wealthy Creole at the time.

It includes a family home, a barn, a privy, an outdoor kitchen, and a bread oven.