Isauro Gabaldon (December 8, 1875-December 21, 1942) was a Resident Commissioner from the Philippine Islands.
He was born in San Isidro, Nueva Ecija. He studied in the public schools of Cuenca, Spain, and in the colleges of Quintana del Rey and Villanueva de la Tara, where he graduated in 1893. He studied law in the Universidad Central de Madrid, Spain and graduated from the Universidad de Santo Tomas in Manila, where he graduated with the degree of LL.B. in 1900. He practiced law from 1903 to 1906.
He was governor of the Province of Nueva Ecija in 1906 and 1912-1916. On July 13,1907, he was elected Deputy to the first Philippine Assembly, and re-elected to the same office in the general elections of 1909. In the Philippine Assembly he was noted for his education bill, known as the Gabaldon Law, which provided an appropriation of one million peso for the building of modern public schools throughout the Philippines, and for his agricultural and tenancy measures protecting the interests of small farmers and farm laborers. In the first election for Senators under the Jones Law of 1916, he was elected Senator from the third senatorial district; and, in 1920, he was appointed Resident Commissioner to Washington, D.C., by the Philippine Legislature, which position he held for two consecutive terms. He was reelected in 1923 and 1925, and served from March 4, 1920, until his resignation effective July 16, 1928, having been nominated for election to the Philippine house of representatives. He had also been elected in 1925 as a member of the Philippine house of representatives, but did not qualify, preferring to continue as Commissioner.