Mexico in the OTI Festival 1973

Mexico was represented at the OTI Festival 1973 with the song "Qué alegre va María", written by Celia Bonfil, and performed by Imelda Miller. The Mexican participating broadcaster, Televisa, selected its entry through a national televised competition with several phases. The song, that was performed in position 13, placed first out of 14 competing entries tying with the song from Peru in 10 votes, and winning the festival after applying the tie-breaking rule.

However, the national final had been won by "La canción del hombre", written by Felipe Gil and performed by Gualberto Castro, which became ineligible for the festival since it was later proven that it had been broadcast on the radio before the permitted date. "Qué alegre va María", which had been the runner-up in the national final, was sent instead. This was the first entry from Mexico to actually participate in the OTI Festival, since the previous year's entry was disqualified and no replacement was sent.