| Honorific-Prefix: | The Honorable |
| Prospero Sanidad | |
| Party: | Liberal (1946-1947) Nacionalista (1934-1946) |
| Birth Name: | Prospero Casia Sanidad |
| Birth Date: | 17 January 1897 |
| Birth Place: | Narvacan, Ilocos Sur, Captaincy General of the Philippines |
| Death Place: | Philippines |
| Alma Mater: | University of the Philippines George Washington University National University School of Law |
| Spouse: | Rosario Centeno |
| Partner: | Victoria Arevalo Lourdes Locsin |
| Children: | 3 |
| Term Start: | 22 May 1947 |
| Term End: | 30 December 1947 |
| Office2: | Member of the House of Representatives from Ilocos Sur's 2nd district |
| Term Start2: | 30 December 1938 |
| Term End2: | 25 May 1946 |
| Term Start3: | 5 June 1934 |
| Term End3: | 16 September 1935 |
| Predecessor2: | Sixto Brillantes Sr. |
| Successor2: | Fidel Villanueva |
| Predecessor3: | Fidel Villanueva |
| Successor3: | Sixto Brillanes Sr. |
Prospero Casia Sanidad (17 January 1897 – 1969) was a Filipino politician and lawyer.
Sanidad was born on 17 January 1897 in Narvacan, Ilocos Sur to Cipriano Sanidad and Cayetana Casia. He pursued his higher education at the University of the Philippines, George Washington University and the National University School of Law in Washington DC, where he graduated with a Bachelor of Laws degree. He was admitted to the Bar in 1928.[1]
Sanidad was elected in 1934 to the House of Representatives as a Nacionalista representative of Ilocos Sur's 2nd district in 1934 and served until 1935. He was elected again to the position in 1938 and reelected in 1941, but was only able to take his second consecutive term in office due to the Japanese occupation during the Second World War.[2]
In 1946, he joined the Liberal Party and ran for the Philippine Senate but lost. However, he filed an electoral protest that became highly controversial, as it coincided with other protests filed against members of Congress belonging to the Nacionalista Party and the Democratic Alliance. In 1947, he won his protest and was sworn in, replacing José E. Romero.[3]
Sanidad was married to Rosario Centeno and had three children.[1]