Coalescence may refer to:

• Coalescence (genetics), the merging of genetic lineages backwards time to a most recent common ancestor
• Coalescence (linguistics), the merging of two or more words into one
• Coalescence (meteorology), the merging of two or more droplets of precipitation into one
• Coalescence (computer science), the merging of adjacent blocks of memory to fill gaps caused by deallocated memory
• Coalescence (welding), the growing together or growth into one body of the materials being joined
• Coalescence (chemistry), the process by which three separate masses of miscible substances seem to "pull" each other together should they make the slightest contact.

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