Heilika of Pettendorf-Lengenfeld (also known as Eilika; c. 1103 – 14 September 1170; buried in Ensdorf Abbey) was by marriage Countess Palatine of Bavaria.

She was one of the two daughters of the edelfrei Lord Frederick III of Pettendorf-Lengenfeld-Hopfenohe, who died between 1112 and 1119 without a male heir.

He donated Scheyern Castle to the Benedictine Order, who turned it into a monastery.

Otto and Heilika had eight children: Heilika's sister Heilwig was married to Count Gebhard I of Leuchtenberg and brought the Lordship of Waldeck [1] into the marriage.

Heilika died on 14 September 1170 and was buried in Ensdorf Abbey.