Lucky Star is a 1929 sound part-talkie American romantic drama film starring Janet Gaynor and Charles Farrell, and directed by Frank Borzage. In addition to sequences with audible dialogue or talking sequences, the film features a synchronized musical score and sound effects along with English intertitles. The soundtrack was recorded using the Movietone sound-on-film system. The plot involves the impact of World War I upon a farm girl (Gaynor) and a returning soldier (Farrell).

The movie was produced by William Fox with cinematography by Chester A. Lyons and William Cooper Smith, and the supporting cast includes Paul Fix and Guinn "Big Boy" Williams. In the previous two years, Borzage had also directed Gaynor in 7th Heaven and Street Angel, two of the three films (along with F.W. Murnau's Sunrise: A Song of Two Humans) for which Gaynor won the first Academy Award for Best Actress.

The film was produced in two versions- a silent version for the foreign market, and a partly talking version with sound effects and some dialogue for American release. Both versions were thought lost until the silent film was rediscovered in the archives of the Dutch Filmmuseum in the late 1980s and subsequently restored. The talking version of the film remains lost.