Here is a list of mergers in Osaka Prefecture, Japan since the Meiji era.

Prefectural mergers and border changes

''This list is incomplete. Many changes are missing.''

Osaka before 1881

Nara before 1876

See the List of mergers in Nara Prefecture

Sakai

Osaka since 1881

District mergers

''This list is incomplete. Some mergers are missing.''

Municipal mergers

''This list is incomplete. Most mergers are missing.''

Establishment of modern municipalities 1889/1896

After the modern municipalities (cities, towns and villages) were introduced and the Great Meiji mergers performed in 1889 and after the 1896, Osaka consisted of:

Mergers 1889–1950

Mergers in the 1950s (Great Shōwa mergers)

Mergers since the 1960s