Mersin is an electoral district of the Grand National Assembly of Turkey.

It elects eleven members of parliament (deputies) to represent the province of the same name for a four-year term by the D'Hondt method, a party-list proportional representation system.

Population reviews of each electoral district are conducted before each general election, which can lead to certain districts being granted a smaller or greater number of parliamentary seats.

Mersin elected 12 members until the most recent election in 2011, when the number of seats was dropped to eleven.