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.

The lieutenant and his men are billeted on the town where the Justice's family lives, and although the lovers are thus continually in close proximity, Lauretta's jealous father prevents them from often meeting.

Their complaints are of no serious turn however, one soldier grieving that he is not allowed a "light to go to bed by" at his inn, whereas the provocation they give includes occasionally "fling[ing] a cartridge into the kitchen fire", or "drum[ming] up and down stairs" during the night.

Dr Rosy, a man of sentimental character who is obsessively mourning the recent loss of his beloved wife Dolly, is a friend of the Lieutenant's.

The play ends happily, with Justice Credulous withdrawing his objection :"I give my daughter to you, who are the most impudent dog I ever saw in my life", and that the affair will provide he and his wife "a good subject for [them] to quarrel about the rest of [their] lives".