Leffler is a surname. Notable people with the surname include:
*Anne Charlotte Leffler (1849–1892), Swedish author
*Edward G. Leffler, salesman who started the first mutual fund
*Gösta Mittag-Leffler (1846–1927), Swedish mathematician
*Greg Leffler (born 1951), former driver in the CART Championship Car series
*Isaac Leffler (1788–1866), represented Virginia's 18th congressional district in the US House of Representatives in the 1820s
*Jason Leffler (1975–2013), NASCAR/Indy Car driver from Long Beach, California
*John Leffler, former Australian racing driver
*Marta Leffler (1903–1990), American actress better known as Marta Linden
*Melvyn P. Leffler, American historian, and Edward Stettinius Professor of History at the University of Virginia
*Samuel J Leffler, computer scientist, known for his extensive work on BSD, from the 1980s to FreeBSD in the present day
*Shepherd Leffler (1811–1879), one of the two original U.S. Representatives from Iowa
See also
*28394 Mittag-Leffler (1999 RY36) is a main-belt asteroid discovered on September 13, 1999, by P. G. Comba at Prescott
*Mittag-Leffler's theorem
*Mittag-Leffler function
*Mittag-Leffler Institute, mathematical research institute located in Djursholm, a suburb of Stockholm
*Mittag-Leffler star of a complex-analytic function is a set in the complex plane obtained by attempting to extend that function along rays emanating from a given point
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