Henry Messmer (August 25, 1839–February 20, 1899) was a Swiss-American architect who practiced in Milwaukee, Wisconsin from 1866 until his death.
He was a prolific designer of institutional buildings as well as homes on Milwaukee's near north and east sides.
[1] Born in Switzerland, Messmer studied architecture at Heidelberg University and apprenticed in Europe before coming to Wisconsin in 1866.
Prominent works include the churches of St. Hedwig's (1886), St. Hyacinth (1882), and Saints Peter and Paul (1890) in Milwaukee, St. Mary's in Port Washington (1881), and the rectory of St. Casimir's in Milwaukee.
His son Robert A. Messmer joined the firm not long after graduating from East Division High School in 1887, after which the firm was renamed H. Messmer & Son.