"St. Valentine's Day" is the eleventh episode of the third season, and forty-seventh episode overall, of the American television comedy series 30 Rock. It was written by co-executive producer Jack Burditt and series' creator, executive producer and lead actress Tina Fey. The director of this episode was series producer Don Scardino. The episode originally aired on NBC in the United States on February 12, 2009. Guest stars in "St. Valentine's Day" include Marylouise Burke, Jon Hamm, Salma Hayek, Zak Orth, Laila Robins, Maria Thayer, and Allie Trimm.

The third season of 30 Rock, an American television comedy series, consists of 22 episodes and began airing on October 30, 2008, on the NBC network in the United States. The season was produced by Broadway Video, Little Stranger, and NBC Universal; the executive producers were series creator Tina Fey, Lorne Michaels, Marci Klein, David Miner, and Robert Carlock.