Alpaida (also Alphaida, Alpoïde, Elphide, Elfide, Chalpaida; ca. 654 – ca. 714) was a noblewoman of the House of Pepin. The daughter of Alberic of Austrasia and Adèle of Poiters, she was Pepin II's (635 or 640 – December 16, 714) second wife and mother to two sons, Charles Martel (Charles the Hammer) (d. October 22, 741) and Childebrand (678–751).