OTI Festival 1977 was the sixth edition of the annual OTI Festival. It took place in Madrid, Spain, following the country's victory at the 1976 contest with the song "Canta cigarra" by María Ostiz. Organised by the Organización de Televisión Iberoamericana (OTI) and host broadcaster Radiotelevisión Española (RTVE), the contest was held at the Centro Cultural de la Villa de Madrid on Saturday 12 November 1977 and was hosted by Mari Cruz Soriano and Miguel de los Santos.

OTI Festival, often known simply as La OTI, was an international song competition, organised annually between 1972 and 2000 by the Organización de Televisión Iberoamericana (OTI), featuring participants representing primarily Ibero-American countries. Each participating OTI member broadcaster submitted an original song primarily in Spanish or Portuguese to be performed on live television and transmitted to all OTI broadcasters via satellite. It was preceded by the Festival Mundial de la Canción Latina, held in 1969 and 1970 in Mexico.