This is a list of the Top 50 singles in 2009 in New Zealand, as listed by the Recording Industry Association of New Zealand (RIANZ).
Smashproof's "Brother" was the longest-running song in 2009, peaked at number one in eleven weeks in a row. The Black Eyed Peas's "I Gotta Feeling" and Keri Hilson's "Knock You Down" behind "Brother" for longest-running at number one, with 9 weeks and 6 weeks. Beyoncé's "Halo" was the longest-running in the chart this year, spent 33 weeks inside the chart. Black Eyed Peas' "I Gotta Feeling" and Smashproof's "Brother" tied in the second place, with 29 weeks and Taylor Swift's "Love Story" in the third place with 27 weeks.
- ‡ – Single of New Zealand origin