Slieve Croob (from Irish Sliabh Crúibe 'mountain of the hoof')[1] is a mountain with a height of 534 metres (1,752 ft)[2] in the middle of County Down, Northern Ireland.

It is designated an Area of Outstanding Natural Beauty and is the source of the River Lagan.

There is a small road to the summit, where there is an ancient burial cairn and several transmitter stations with radio masts.

[3] The cairn on its summit is believed to be the remains of an ancient burial mound, possibly of a passage tomb like the one on Slieve Gullion.

[9] Legannany Dolmen sits on the southern slopes of Slieve Croob near the village of Leitrim.