| OTI Festival 1977 | |
|---|---|
 | |
| Dates | |
| Final | 12 November 1977 |
| Host | |
| Venue | Centro Cultural de la Villa de Madrid, Madrid |
| Presenter(s) | Mari Cruz Soriano Miguel de los Santos |
| Musical director | Rafael Ibarbia |
| Host broadcaster | Radiotelevisión Española (RTVE) |
| Participants | |
| Number of entries | 21 |
| Debuting countries | None |
| Returning countries |  Portugal  Dominican Republic |
| Non-returning countries | None |
| Vote | |
| Voting system | Each country had three jurors and each of them voted for their favourite entry. |
| Winning song |  Nicaragua Eduardo González: "Quincho Barrilete" |
OTI Festival 1977 (Spanish: Sexto Gran Premio de la Canción Iberoamericana, Portuguese: Sexto Grande Prêmio da Canção Ibero-Americana) 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.
In this edition of the contest, the number of participating countries experienced a new record of twenty-one competing entries selected by their participating broadcasters. The winner was the Nicaraguan entrant Eduardo "Guayo" González with the song "Quincho Barrilete", known for the social content of the lyrics.