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Gerrymandering is a form of boundary delimitation (redistricting) in which electoral district or constituency boundaries are deliberately modified for electoral purposes, thereby producing a contorted or unusual shape. The resulting district is known as a gerrymander; however, that word can also refer to the process.

Gerrymandering may be used to achieve desired electoral results for a particular party, or may be used to help or hinder a particular group of constituents, such as a political, racial, linguistic, religious or class group.

When used to allege that a given party is gaining disproportionate power, the term gerrymandering has negative connotations. However, a gerrymander may also be used for purposes that some perceive as positive, notably in US federal voting district boundaries which produce a proportion of constituencies with an African-American or other minority in the majority (these are thus called "minority-majority districts").