Cardiff Central (Welsh: Canol Caerdydd) is a constituency of the Senedd. It elects one Member of the Senedd by the first past the post method of election. Also, however, it is one of eight constituencies in the South Wales Central electoral region, which elects four additional members, in addition to eight constituency members, to produce a degree of proportional representation for the region as a whole.

From 1999, Cardiff Central was a safe seat for the Liberal Democrats. However the seat was lost to Labour in 2011 with a huge 14.7% swing. In 2016 this was the Liberal Democrats target seat with their candidate Eluned Parrott a current regional AM for South Wales Central. The result actually saw a very slight increase in Labour's majority in a very disappointing night for the Liberal Democrats. The seat remained one of the most marginal in the Assembly until the 2021 Senedd election, where Labour increased their majority substantially.

Furthermore, in 2016 two former Big Brother participants were the candidates for Plaid Cymru and the Conservatives.

The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Cardiff Central Westminster constituency. It is entirely within the preserved county of South Glamorgan.

The other seven constituencies of the region are Cardiff North, Cardiff South and Penarth, Cardiff West, Cynon Valley, Pontypridd, Rhondda and Vale of Glamorgan.

In general elections for the Senedd, each voter has two votes. The first vote may be used to vote for a candidate to become the Member of the Senedd for the voter's constituency, elected by the first past the post system. The second vote may be used to vote for a regional closed party list of candidates. Additional member seats are allocated from the lists by the d'Hondt method, with constituency results being taken into account in the allocation.