St Patrick's Day, or, The Scheming Lieutenant is an 18th-century play by Irish playwright and poet Richard Brinsley Sheridan (1751-1816), first performed on 2 May 1775 at Covent Garden. It is said to have completed by the author within two days. Sheridan wrote the two-act farce for the benefit performance of lead actor Lawrence Clinch, who had so successfully played Sir Lucius O'Trigger in his previous play The Rivals.