Osthryth was buried at Bardney in Lindsey, the monastery where, at her urging, the relics of her uncle, Oswald of Northumbria, were kept and revered, though evidence of resistance at Bardney to the cult of Oswald is also indicative of the poor relations between the two kingdoms.
Osthryth foi enterrada en Bardney en Lindsey, o mosteiro onde a petición súa conservábanse e veneraban as reliquias do seu tío, Oswald de Northumbria, aínda que as probas da resistencia de Bardney ao culto de Oswald tamén son indicativas das pobres relacións entre os dous reinos.