List of number-one R&B singles of 2005 (U.S.)

This is a list of singles that reached number one on the Billboard Hot R&B/Hip-Hop Songs chart in the United States during the year 2005. This chart, published weekly by Billboard magazine, ranks the most popular R&B and hip hop songs in the U.S., based on radio airplay, sales, and streaming activity. The songs are predominantly by African-American artists, although the chart is not exclusively limited to them. Each entry lists the song title, the artist(s) performing the song, and the date on which the song reached the number one position. The list represents the most commercially successful R&B/Hip-Hop singles of the year as determined by Billboard's methodology.