Decoroso Ras Rosales (December 20, 1907 – January 23, 1987) was a Filipino politician.

[1] Rosales was elected in 1941 to the House of Representatives to represent the 1st district of Samar, defeating Secretary of Public Works Jose Avelino, but was not able to take office until 1945 due to the Japanese invasion during the Second World War.

During that period, he joined the resistance movement and became civil administrator for unoccupied areas of Cebu, attaining the rank of Colonel.

[1] As a senator, he was one of three members of the body who opposed the passage of the Rizal Law, along with Mariano Jesús Cuenco and Soc Rodrigo.

[3] His older brother Julio Rosales was a senior clergyman in the Roman Catholic Church who rose to become a cardinal and Archbishop of Cebu.