Campanula portenschlagiana, the wall bellflower,[2] is a species of flowering plant in the family Campanulaceae, native to the Dalmatian Mountains in Croatia.

It is a vigorous, low-growing, mound-forming evergreen perennial with deep purple flowers in summer.

Deep purple or blue, funnel-shaped, 5-petalled flowers, 2 cm (0.8 in) long, are borne in profusion, completely covering the plant from mid- to late summer.

The Latin specific epithet portenschlagiana commemorates the Austrian naturalist Franz von Portenschlag-Leydermayer (1772–1822).

[5] Given suitable conditions, it will rapidly colonise cracks and crevices in walls and pavements.