Thomas J. O'Brien (Michigan politician)

Thomas J. O'Brien (born c. 1943) is an American politician who served in the Michigan House of Representatives.

O'Brien was a Democratic representative for the 42nd District, encompassing parts of Kalamazoo County, from 1979 until 1992. During his tenure, he served on various committees, including those focused on natural resources and the environment. He was particularly involved in issues related to agriculture, land use, and conservation. He was known for his advocacy for rural communities within his district. After leaving the House, O'Brien remained active in local politics and community initiatives in the Kalamazoo area. Specific details regarding his activities after leaving the House are limited.