Finland was represented at the Eurovision Song Contest 1966 with the song "Playboy", written by Ossi Runne, and performed by Ann-Christine. The Finnish participating broadcaster, (Yle), selected its entry through a national final.
Nine entries were selected for the competition from 200 received submissions. (Yle) held the national final on 22 January 1966 at its studios in Helsinki. The final was not broadcast live since it had been recorded earlier in the afternoon. The show was hosted by and . The winner was chosen by a professional jury consisting of twelve members. Each juror distributed their points as follows: either 1, 3 and 5 points for three songs, or 3 and 6 points for two songs. Since the first round did not end up in an absolute win, the second round was held between the top 3.
On the evening of the final Ann-Christine performed seventh in the running order, following Norway and preceding Portugal. It was the first Finnish entry conducted by Ossi Runne, who would conduct the Finnish Eurovision entry 22 times. At the close of voting, Finland picked up seven points and placed joint 10th with Germany and Luxembourg of the 18 entries.
The 10-member Finnish jury comprised (chairperson), Benedict Zilliacus, Jutta Zilliacus, , Juhani Valsta, Antti Wahlström, Mrs. Bojen Huldén, Albert Pelli, Leena Lehtonen, and .
The contest was broadcast on and on radio station , both with commentary by . It was also broadcast on Swedish-language radio station .