Delaware's 3rd Senate district is one of 21 districts in the Delaware Senate. It has been represented by Democrat Elizabeth Lockman since 2018, succeeding fellow Democrat Robert Marshall.
District 3 is based in downtown Wilmington, also covering some unincorporated areas to the south.
Like all districts in the state, the 3rd Senate district is located entirely within Delaware's at-large congressional district. It overlaps with the 2nd, 3rd, 4th, and 13th districts of the Delaware House of Representatives. At 5 square miles, it is the smallest Senate district in the state.
Delaware Senators are elected to staggered four-year terms. Under normal circumstances, the 3rd district holds elections in midterm years, except immediately after redistricting, when all seats are up for election regardless of usual cycle.