The Michigan Senate is the upper house of the Michigan Legislature. Along with the Michigan House of Representatives, it composes the state legislature, which has powers, roles and duties defined by Article IV of the Michigan Constitution, adopted in 1963. The primary purpose of the Legislature is to enact new laws and amend or repeal existing laws.

The Michigan Legislature is the legislature of the U.S. state of Michigan. It is organized as a bicameral body composed of an upper chamber, the Senate, and a lower chamber, the House of Representatives. Article IV of the Michigan Constitution, adopted in 1963, defines the role of the Legislature and how it is to be constituted. The chief purposes of the Legislature are to enact new laws and amend or repeal existing laws. The Legislature meets in the Capitol building in Lansing.