In Mabanag v. Lopez Vito, 78 Phil. 1 (1947), Perfecto dissented after the majority declined to examine whether the requisite votes in the House and Senate were obtained in the passage of an amendment to the Constitution allowing American citizens the right to use and develop natural resources in the Philippines.
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In 1958, the City of Manila named a secondary school in Tondo, Manila the Gregorio Perfecto High School after the late Justice.
San Gregorio Matese | San Gregorio | Gregorio Fernández | Gregorio Panzani | San Gregorio Magno | Juan Gregorio de las Heras | Gregorio Vargas | Gregorio Marañón | Gregorio Hernandez Rios 'El Goyo' | Gregorio Carafa | San Gregorio d'Ippona | Ryan Gregorio | Perfecto de Castro | Manuel Gregorio Acosta | Gregorio Reyes | Gregorio Petrocchini | Gregorio Perfecto High School | Gregorio Perfecto | Gregorio Paz | Gregorio Luperón International Airport | Gregorio Luperón | Gregório Lopes | Gregorio II Boncompagni | Gregorio Di Leo | Colegio de San Gregorio | BRP ''Gregorio del Pilar'' (PF-15) |
On September 25, 1958 then mayor Arsenio H. Lacson approved Resolution No. 529 changing Ismar High School to Gregorio Perfecto High School in honor of the late Supreme Court Associate Justice Gregorio Perfecto, one of the signatories of the 1935 Constitution who used to represent Tondo in Congress.