Elizabeth Osliff (née Knowles; 1692 – ????) was the 8th great-grandmother of Cometan, classified as one of Cometan’s distant paternal ancestors in the McKerney family line. Born in Warton, Lancashire, Elizabeth married John Osliff and had at least one child, also named John. Little else is known of Elizabeth’s life as neither the identity of her parents nor details about her death are currently known.
In Cometanic ancestry, Elizabeth is categorised as part of the 10th generation retrograde, classifying her as a distant ancestor of Cometan.