锡尔迪金（英语：Ceredigion）是英国威尔士的一个郡，濒临卡迪根湾，面积为1783平方千米，于爱德华一世征服威尔士后所设，人口共75,900人，52％的居民使用威尔士语，境内拥有阿伯里斯特威斯大学。

Ceredigion (/ˌkɛrᵻˈdɪɡiən/; Welsh pronunciation: [kɛrɛˈdɪɡjɔn]) is a county in Mid Wales. The county was created as Cardiganshire (Welsh:Sir Aberteifi) in 1282 in the area of the former Kingdom of Ceredigion. The historic county was abolished in 1974 and reconstituted in 1996 as Ceredigion. The county had a population of 75,900 at the 2011 UK census. Aberystwyth, which is the largest town, is one of the two administrative centres; the other being Aberaeron. Aberystwyth houses Aberystwyth University, Bronglais Hospital and the National Library of Wales. The inland town of Lampeter houses part of the University of Wales Trinity Saint David.