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{{about|algorithms specific to paging|an outline of general cache algorithms (e.g. processor, disk, database, web)|Cache algorithms}}
{{Use dmy dates|date=February 2021}}
In a [[computer]] [[operating system]] that uses [[memory paging|paging]] for [[virtual memory]] [[memory management|management]], '''page replacement algorithms''' decide which memory pages to page out, sometimes called swap out, or write to disk, when a [[page (computer memory)|page]] of memory needs to be allocated. [[Paging|Page replacement]] happens when a requested page is not in memory ([[page fault]]) and a free page cannot be used to satisfy the allocation, either because there are none, or because the number of free pages is lower than some threshold.
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