The Reverend Robert Willis (27 February 1800 – 28 February 1875) was an English academic. He was the first Cambridge professor to win widespread recognition as a mechanical engineer, and first to set the scientific study of vowels on a respectable foundation. He is now best remembered for his extensive writings on architectural history, including many studies of mediaeval cathedrals and a four-volume treatise on the architecture of the University of Cambridge. He was described by Pevsner as "the greatest English architectural historian of the 19th century".[1]: 499