New Hampshire's 21st State Senate district is one of 24 districts in the New Hampshire Senate.

It has been represented by Democrat Rebecca Perkins Kwoka since 2020, succeeding fellow Democrat Martha Fuller Clark.

[3] District 21 covers parts of eastern Rockingham and southern Strafford Counties.

Strafford County - 17% of county Results are of elections held under 2022 district lines.

The following result occurred prior to 2022 redistricting, and thus were held under different district lines.