| Honorific-Prefix: | The Honorable |
| Melecio Arranz | |
| Office: | 5th President pro tempore of the Philippine Senate |
| President: | Manuel Roxas |
| Term Start: | May 25, 1946 |
| Term End: | December 30, 1949 |
| Predecessor: | Elpidio Quirino |
| Successor: | Quintín Paredes |
| Office2: | Senate Majority Leader |
| President2: | Sergio Osmeña |
| Term Start2: | June 9, 1945 |
| Term End2: | May 25, 1946 |
| Predecessor2: | Claro M. Recto |
| Successor2: | Vicente J. Francisco |
| Office3: | Senator of the Philippines |
| Term Start3: | May 25, 1945 |
| Term End3: | December 30, 1951 |
| Office4: | Senator of the Philippines from the 1st district |
| Term Start4: | June 5, 1928 |
| Term End4: | September 16, 1935 |
| Predecessor4: | Isabelo de los Reyes |
| Successor4: | Post abolished |
| Alongside4: | Elpidio Quirino |
| Birth Date: | 24 May 1888 |
| Birth Place: | Alcala, Cagayan, Captaincy General of the Philippines |
| Death Place: | Mandaluyong, Rizal, Philippines |
| Nationality: | Filipino |
| Party: | Liberal (1946–1966) |
| Otherparty: | Nacionalista (1928–1946) |
| Spouse: | Consuelo Argüelles Arranz |
| Children: | 5 |
| Alma Mater: | University of Santo Tomas |
| Occupation: | Politician |
| Profession: | Civil engineer |
Melecio Arranz y Alivin (May 24, 1888[1] - April 24, 1966) was a Filipino politician and engineer, born in Alcala, Cagayan.
He obtained his degree of Bachelor of Arts from Colegio de San Albero Magno and his Bachelor of Science in Civil Engineering from the University of Santo Tomas.[1] His government service began in 1914 when he worked as Junior Assistant Engineer at the Bureau of Public Works and became District Engineer of Bataan and Rizal (1919) and later was promoted as Supervising District Engineer.[2]
As Senator, he was elected in 1928 representing the First Senatorial District comprising Cagayan, Isabela, Ilocos Sur, Ilocos Norte and Abra. Reelected in 1934, 1941 and 1946, his term ended in 1951. He was the Majority leader of the Senate of the Philippines from 1945 to 1946. He was floor leader and Chairman of the Committee on Public Works and Communications (1936) and floor leader and Senate President Pro-Tempore (1946–1949).[2]
Arranz also served in the Philippine Council of State in 1934 and in the Japanese-sponsored Preparatory Committee on Philippine Independence, which laid out the establishment of the Second Philippine Republic in 1943.[1]
In 1947, he was appointed Chief Delegate of the Philippines to the United Nations Commission on Korea.[2]
Arranz was married to Consuelo Arguelles and had five children.[1] He died on April 24, 1966.[2]