Royal Castle is a fast food restaurant chain in Trinidad and Tobago.

Royal Castle was founded in 1968 by two Trinidadian couples, Irene and Vernon Montrichard and Marie and Ray Permenter in Port of Spain as the first fast food chain in Trinidad and Tobago.

The restaurant was one of the first establishments to acknowledge the use of seasonings from Paramin in the preparation of its products, such as pepper sauce.

At various times there are specials where one can purchase combinations of products at "even more attractive prices" or participate in National Lottery Control Board (NLCB) approved promotions.

This restaurant has no relation to the Miami, Florida-based hamburger chain Royal Castle, launched in 1938 by William Singer.