List of Billboard number-one disco singles of 1979

The National Disco Action Top 40 was a chart published weekly by Billboard magazine in the United States, which ranked the popularity of disco singles in nightclubs across the country, based on a national survey of club disc jockeys. Adjusted multiple times during 1979, the chart expanded to 60 positions on April 7, and was renamed the Disco Top 80 on April 14.