Michael Jackson's Bad and Katy Perry's Teenage Dream albums, both of which had 5 number ones.
the band called "CHICAGO".
German band, Tangerine Dream, has more than 100 albums.
The Beatles (23 in Australia, 23 in The Netherlands, 22 in Canada, 21 in Norway, 20 in the U.S., and 18 in Sweden), they could easily have had even more number ones, but they were often competing...
the grateful dead