Chile in the OTI Festival 1980
Chile was represented at the OTI Festival 1980 with the song "Sin razón", written and performed by. The Chilean participating broadcasters, Televisión Nacional de Chile, Universidad Católica de Chile Televisión, and Universidad de Chile Televisión, jointly selected their entry through a televised national final. The song, that was performed in position 1, placed 14th out of 23 competing entries, tied with the entry from Portugal with 9 points.
National stage
Televisión Nacional de Chile, Universidad Católica de Chile Televisión, and Universidad de Chile Televisión, held a national final jointly to select their entry for the 9th edition of the OTI Festival. Seven songs were shortlisted for the televised final.| Song | Artist | Songwriter |
| "El muchacho del tren" | Capri | Osvaldo Leiva |
| "El titiritero" | Héctor Molina | |
| "Fundamental" | Carolina Tocornal | |
| "La canasta" | Osvaldo Díaz | Ricardo de la Fuente |
| "Marisol Giraud" | Fernando Ubiergo | Fernando Ubiergo |
| "Para este amor" | María Angélica Ramírez | |
| "Sin razón" | Nino García |
National final
The broadcasters held the national final on Monday 13 October 1980, beginning at 21:30 CLST, at the Municipal Theatre in Santiago. It was presented by Raúl Matas, and broadcast on TVN's Canal 7, UCTV's Canal 13, and UTV's Canal 11. Each of the competing performances was pre-recorded in a different location within the building.The members of the jury were: Franz Benko, José Goles, Benjamín Mackenna, Stefan Tertz, and.
The winner was "Sin razón", written and performed by. The song, that tied with 23 points with "Para este amor", written by María Angélica Ramírez and performed by, won after the tie-breaking vote.
| Song | Artist | Points | Result | |
| 1 | "El muchacho del tren" | Capri | 22 | 3 |
| 2 | "La canasta" | Osvaldo Díaz | 14 | 6 |
| 3 | "El titiritero" | Héctor Molina | 15 | 4 |
| 4 | "Fundamental" | Carolina Tocornal | 15 | 4 |
| 5 | "Para este amor" | 23 | 2 | |
| 6 | "Marisol Giraud" | Fernando Ubiergo | 13 | 7 |
| 7 | "Sin razón" | 23 | 1 |
| Song | scope="col" | scope="col" | scope="col" | scope="col" | scope="col" | Total | |
| 1 | "El muchacho del tren" | 4 | 4 | 5 | 4 | 5 | 22 |
| 2 | "La canasta" | 3 | 2 | 2 | 3 | 4 | 14 |
| 3 | "El titiritero" | 2 | 3 | 3 | 3 | 4 | 15 |
| 4 | "Fundamental" | 2 | 3 | 3 | 3 | 4 | 15 |
| 5 | "Para este amor" | 4 | 5 | 4 | 5 | 5 | 23 |
| 6 | "Marisol Giraud" | 2 | 2 | 3 | 3 | 3 | 13 |
| 7 | "Sin razón" | 4 | 5 | 5 | 4 | 5 | 23 |
At the OTI Festival
On 15 November 1980, the OTI Festival was held at the Martín Coronado hall of the Teatro General San Martín in Buenos Aires, Argentina, hosted by Argentina Televisora Color, and broadcast live throughout Ibero-America. Nino García performed "Sin razón" in position 1, with Gonzalo García conducting the event's orchestra, placing 14th out of 23 competing entries, tying with the entry from Portugal with 9 points.The festival was broadcast on TVN's Canal 7, UCTV's Canal 13, UTV's Canal 11, and.
Voting
Each participating broadcaster, or group of broadcasters that jointly participated representing a country, assembled a jury who awarded 5–1 points to their five favourite songs in order of preference.| Score | Country |
| 5 points | |
| 4 points |  Mexico |