Solo artists are alphabetized by last name, Groups by group name excluding "A", "An", and "The".
Each act's total of number-one singles is shown after their name.
All artists who are mentioned in song credits are listed here; this includes one-time pairings of otherwise solo artists and those appearing as featured (for example, both Delta Goodrem and Brian McFadden get a credit for "Almost Here").
Artists associated with a group who reached number one, yet have their own solo page in Wikipedia, are not listed here unless they hit number one as a solo artist.