Purkyně is a lunar impact crater that lies just beyond the eastern limb of the Moon, on the far side from the Earth.

When conditions of libration and sunlight allow, this crater can be viewed from the Earth, although it is seen from a very low angle and not much detail can be seen.

The satellite crater Purkyně K intrudes into the southeastern rim.

The interior floor is relatively level and featureless, with only a pair of tiny craters along the eastern side.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Purkyně.