Elections for the Maryland Senate were held on November 6, 2018, with all 47 seats being contested. Republicans had initially hoped to break the Democrats' supermajority in the upper chamber by knocking off five incumbents, known as their "Drive for Five" plan. Though they did make a net gain of one seat, they came short of their goal. Three seats switched hands: District 9 in Carroll and Howard Counties flipped from Republican to Democratic while District 38 in Somerset, Wicomico, and Worcester Counties and District 42 in Baltimore County both flipped from Democrats to Republicans.

The 2014 Maryland Senate election were held on November 4, 2014, to elect senators in all 47 districts of the Maryland Senate. Members were elected in single-member constituencies to four-year terms. These elections were held concurrently with various federal and state elections, including for Governor of Maryland.