Daniel Buchanan (14 April 1880 – 1 December 1950, Vancouver) was a Canadian mathematics and astronomy professor and academic administrator.
He was a professor of astronomy and mathematics from 1911 to 1920 at Queen's University, Kingston, Ontario.
He was elected in 1921 a Fellow of the Royal Society of Canada.
At the University of British Columbia he became in 1920 professor and head of the department of mathematics and astronomy and in 1928 dean of the faculty of arts and sciences.
[1] He was an Invited Speaker of the ICM in 1924 at Toronto[2] and in 1928 at Bologna.