Eleanor () is a feminine given name, originally from an Old French adaptation of the Old Provençal name Aliénor. It is the name of a number of women of royalty and nobility in western Europe during the High Middle Ages. The name was introduced to England by Eleanor of Aquitaine, who came to marry King Henry II. It was also borne by Eleanor of Provence, who became Queen consort of England as the wife of King Henry III, and Eleanor of Castile, wife of Edward I.

The name was popular in the United States in the 1910s and 1920s, peaking at rank 25 in 1920. It declined below 600 by the 1970s, again rose to rank 32 in the 2010s. Eleanor Roosevelt, the longest-serving first lady of the US was probably the most famous bearer of the name in contemporary history.

Common hypocorisms include Elle, Ella, Ellie, Elly, Leonor, Leonora, Leonore, Nella, Nellie, Nelly, and Nora.