David Howard Senjem (/ˈsɛndʒəm/ SEN-jəm; born December 20, 1942) is an American politician and member of the Minnesota Senate. He served as its majority leader from 2011 to 2013. A moderate Republican, Senjem has crossed party lines on many occasions, notably environmental policy and women's issues. He represents District 25, which includes portions of Dodge and Olmsted counties in the southeastern part of the state. Much of the northern half of Rochester lies in his district.