The 'Blitz on Cardiff' was the German bombing of Cardiff in south Wales (3 July 1940/11 May 1941).

Between 1940 and a final raid in March 1944, after the end of the the true period of 'The Blitz', approximately 2,100 bombs fell, killing 355 people.

The docks in Cardiff became a strategic bombing target for the Luftwaffe as it was one of the largest coal ports in the world, and as a result the docks and the surrounding area were heavily bombed. Llandaff Cathedral, amongst many other civilian buildings caught in the raids, was damaged by the bombing in 1941.

During 1940 the Luftwaffe targeted Cardiff on 3, 10 and 12 July, and on 7 August. This was followed in 1941 with raids on 2, 3 and 10 January. more than 100 bombers attacked the city over a 10-hour period beginning at 18.37 on the night of 2 January 1941 and dropped high explosive bombs, incendiary bombs and parachute mines. The Riverside area was the first to be bombed. and in Grangetown the Hollyman Brothers bakery was hit by a parachute mine and 32 people who were using the basement as a shelter were killed. When the raid was over 165 people had been killed and 427 more injured, while nearly 350 homes had been destroyed or damaged so badly that they had to be demolished.

Chapels and the nave of Llandaff Cathedral were also damaged. Western Cardiff was the area which was hit the hardest, especially Canton and Riverside, where 116 people were killed; an estimated 50 of these last were killed in De Burgh Street in Riverside. The 10-hour air raid had started at 18.37 and Grangetown was the first area to be hit by 100 German aircraft.

More raids followed on 27 February, 1, 4, 12 and 20 March, 3, 12, 29 and 30 April, and 4 to 11 May.

The raid of 29 April 1941 did not have the usual precursory flares or incendiaries, but four land mines, probably intended for the Civic Centre, came down under their parachutes soon after the siren had sounded. One landed harmlessly in the Castle grounds, narrowly missing the Civic Centre shelter, but the other three had tragic consequences. Ten people died in Lewis Street in Riverside from one mine. The other two fell in Cathays, on Llanbleddian Gardens and Wyverne Road, killing 23 people. The total included 10 members of one family who had taken cover in the Anderson shelter in their back garden. The adjoining parish hall on Wyverne Road was destroyed. Cathays Cemetery sustained damage from a number of bombs and one land mine.

In 1942 there were fewer raids, but two occurred on 30 June and 2 July. In 1943 some of the last raids occurred on 7 May and 17/18 May, of which the second hit the railway station, where the presence of a and a 1,190-lb (540-kg) unexploded bomb threatened to stop rail traffic. On the final raid, one of the German bombers mistook the Irish Sea for the Severn river and bombed Cork on the southern coast of Ireland.