Sir Patrick Walsh (fl. 1580 – c.1610) was an Irish ambassador and friar. Patrick Walsh was a knight and wealthy merchant in the city of Waterford, becoming Mayor of Waterford in 1578. He was an older half-brother of Thomas Walsh, Archbishop of Cashel 1626–54. Another brother, Richard Walsh, was a Jesuit. (1992, n. 28, p. 191).