| Honorific-Prefix: | The Honourable |
| Decoroso Rosales | |
| Birth Name: | Decoroso Ras Rosales |
| Birth Date: | 20 December 1907 |
| Birth Place: | Calbayog, Samar, Philippine Islands |
| Office1: | Senator of the Philippines |
| Term Start1: | 30 December 1955 |
| Term End1: | 30 December 1961 |
| Office2: | Member of the House of Representatives from Samar's 1st district |
| Term Start2: | 11 June 1945 |
| Term End2: | 25 May 1946 |
| Predecessor2: | Agripino Escareal |
| Successor2: | Agripino Escareal |
| Office3: | Governor of Samar |
| Term Start3: | 1950 |
| Term End3: | 1925 |
| Predecessor3: | Baltazar Avelino |
| Successor3: | Fernando Veloso |
Decoroso Ras Rosales (20 December 1907 – 23 January 1987) was a Filipino politician.
Rosales was born on 20 December 1885 in Calbayog, Samar to Basilio Rosales and Aqueda Ras. He received his Associate of Arts degree in 1920 and Bachelor of Laws degree both from the University of the Philippines. He was admitted to the Bar in 1933.[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. In 1947, he ran for Governor of Samar as a Nacionalista candidate but lost. He tried again in 1950 and won, but was briefly imprisoned shortly afterwards after a defamation case was filed against him. He served as governor until 1955, when he was elected to the Philippine Senate, serving in that position until 1961.[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.[2]
Rosales was later elected as a delegate to the Philippine Constitutional Convention of 1971 and was also appointed by President Corazon Aquino to become a member of the Philippine Constitutional Commission of 1986 that drafted the current Constitution of the Philippines enacted in 1987.[1]
Rosales was married to Rosita Sepulveda and had two children.[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.[1]
He died in 1987.[4]