These are the Billboard Hot Dance/Disco Club Play and 12 Inch Singles Sales number-one hits of 1989.
From October 26, 1974 until August 28, 1976, Billboard's Disco Action section published weekly single retail sales charts from various local regions along with Top Audience Response Records in their magazine. Billboard debuted its first national chart devoted exclusively to 12-inch Singles Sales in their issue dated March 16, 1985. This record type is most commonly used in disco and dance music genres where DJs use them to play in discos or dance clubs because of the exclusive extended remixes that are often only made available on this format, but Billboard's 12-inch Single Sales chart ranks releases by artists from all styles of music that release maxi-singles.