Gregorio Milian Perfecto was a Filipino journalist, politician and jurist who served as an Associate Justice of the Supreme Court of the Philippines from 1945 to 1949. A controversial figure who was described as an "apostle of liberal causes", Perfecto was notable for his libertarian views, his colorful writing style, and the frequency of his dissenting opinions while on the Supreme Court.

An associate justice of the Supreme Court of the Philippines is one of fifteen members of the Supreme Court of the Philippines, the highest court in the Philippines. The chief justice presides over the high court, but carries only one of the 15 votes in the court. Traditionally, the chief justice is deemed primus inter pares among the justices.