Black Tar Slipway is a public concrete boat ramp on Llangwm Pool, part of the Milford Haven Waterway in Pembrokeshire. Access is available approximately three hours either side of high tide, though the slip has been noted as narrow and crooked.

A small car park and toilets are located nearby. The name Black Tar recalls the area's maritime heritage, when tar was routinely applied to fishing boats to keep them watertight.

Llangwm was once an active herring port, and the waterway around it would have seen considerable small-boat traffic during the fishing season.