Euclid and his Modern Rivals is a mathematical work by the English mathematician Lewis Carroll (1832-1898), issued in 1879 under his real name of Charles Lutwidge Dodgson. It considers the pedagogic merit of a series of contemporary geometry textbooks, demonstrating how each in turn is either inferior to or functionally identical to that of Euclid's Elements. Out of print for a long time, this title has recently being reissued by Cambridge University Press under the Cambridge Library Collection series.