Sister Gregory Kirkus (9 November 1910 – 30 August 2007) was an English Roman Catholic nun, educator, historian and archivist. Born as Phyllis Kirkus in York, she was a historian of English convent life whose own biographical work has provided research tools for historians of the English recusant period. Sister Gregory presided over a collection of antique books, artefacts and manuscripts at the Bar Convent in York, the oldest convent in England, and a girls' school from 1686 to 1985.