Eilika is a feminine given name. Notable people with the given name include:
Eilika of Saxony (c. 1080–1142), daughter of Magnus, Duke of Saxony, and wife of Otto, Count of Ballenstedt Eilika of Schweinfurt (c. 1005–after 1059), daughter of Henry of Schweinfurt, Margrave of the Nordgau, and wife of Bernard II, Duke of Saxony Eilika Weber-Ban (born 1968), German biochemist