Merge, merging, or merger may mean:

• a merger, the combination of two companies into one company
• merger doctrine in law
• phonemic mergers, a linguistic concept whereby two sounds that were originally separate phonemes come to be pronounced exactly the same

In computer science:

• the merge algorithm which combines two or more sorted lists into a single sorted one
• the merge sort, a sort algorithm that sorts a list by relying on the merge algorithm
• Merge (revision control), combines simultaneously changed files in revision control
• Merge (software) is a computer package, a cut-down 'Virtual Machine', for running Windows 9x on x86 processors under UNIX
• Merge (Unix), is a Unix program that can merge three modified versions of a file.
• Merge (SQL) is a Data Manipulation Language statement in SQL.

In music:

• Merge Records, an indie-rock record label based in Chapel Hill, North Carolina
• Merge (album) by Canadian musician Randy Bachman

In industry:

• Merge Healthcare, a medical software company, based in Milwaukee, Wisconsin

In medical research:

• MERGE UK charity funding biomedical research into ME/CFS