Billboard Year-End Hot 100 singles of 2005
The Billboard Hot 100 is a chart that ranks the best-performing singles of the United States. Its data, published by Billboard magazine and compiled by Nielsen SoundScan, is based collectively on each single's weekly physical and digital sales, as well as airplay and streaming. At the end of a year, Billboard will publish an annual list of the 100 most successful songs throughout that year on the Hot 100 chart based on the information. For 2005, the list was published on December 20, calculated with data from December 4, 2004 to November 26, 2005. The R&B track We Belong Together by American singer Mariah Carey was named the number 1 song of 2005 and it spent the longest time at number 1 for the year, 14 weeks. This is also the joint-second longest time at number 1 for a single in the 57-year history of the Hot 100 post-1958 inception, after Mariah Carey's own collaboration with Boyz II Men, One Sweet Day, which spent 16 weeks atop the Hot 100 from 1995 to 1996, and Despacito by Luis Fonsi and Daddy Yankee, featuring Justin Bieber, which equalled that mark in 2017.
- 2005 in music
- Hot 100 number-one hits of 2005 (United States)
- List of number-one hits (United States)
- Billboard Year-End Hot 100 singles of 2006
- Billboard Year-End Hot 100 singles of 2004