Thomas MacLaren (19 February 1863 - 4 December 1928) was a Scottish architect. He was educated at the Kensington School of Art in Edinburgh and the Royal College of Art. After completing his education, MacLaren worked in London, and then moved to the United States for his health. He first lived in Denver, Colorado, and then Colorado Springs, Colorado, where he worked from 1894 until 1928.
Many of the buildings he worked on are listed with the National Register of Historic Places.