13 Going on 30 (released as Suddenly 30 in some countries) is a 2004 American fantasy romantic comedy film written by Cathy Yuspa and Josh Goldsmith, directed by Gary Winick, starring Jennifer Garner and Mark Ruffalo, and produced by Susan Arnold and Donna Arkoff Roth. The film is about a 13-year-old girl in 1987 who awakens to find herself suddenly 30 years old and living in 2004 as a fashion editor.

13 Going on 30 received generally positive reviews from critics, with many praising Garner's performance and its nostalgic environment. It was also praised for its humorous plot and self-empowering message. The film was also a commercial success, earning $22 million in its first week and becoming one of the year's biggest-selling DVD rental titles. Its total box office was over $96 million. Additionally, the soundtrack charted inside the top 50 on the US Billboard 200 chart. Garner's acting earned her nominations from both the MTV Movie Awards and the Teen Choice Awards.