The Ha-Ha Case is a 1934 detective novel by the British author Alfred Walter Stewart, published under his pseudonym J.J.

In a review in the Sunday Times Dorothy L. Sayers wrote "There is no need to say that Mr. Connington has given us a sound and interesting plot, very carefully and ingeniously worked out.

"[3] A complex property inheritance comes to the fore when the youngest member of a family is killed in an apparently accidental shooting accident after he is discovered in a Ha-Ha with his head blown off.

Inspector Hinton, the self-regarding police officer investigation the case, has doubts and pursues the matter turning up evidence about a plot to entrap the young heir by his tutor and his wife with a blackmail scheme and a forged document.

However it falls to Sir Clinton Driffield, arriving late to the case but with the benefit of Hinton's gathering of evidence, to show that the accidental death was really murder and unmask the killer.