Allendale Plantation, also known as the Allendale Plantation Historic District, is a historic site and complex of buildings that was once a former sugar plantation founded c. 1855 and worked by enslaved African Americans. It is located in Port Allen, West Baton Rouge Parish, Louisiana.
The site has been listed on the National Register of Historic Places since November 1, 1996, it is noted for its agricultural significance as an example of a reconstruction era sugar plantation system in southern Louisiana.