公众有限公司（英语：public limited company，合法的缩写为PLC或plc）是英国、英联邦成员国及爱尔兰共和国的公众公司的一个类型。公众有限公司是一种有限责任公司，可以自由上市，但并不强求。股本最低为£50,000，公司名称后面要标注“PLC”。

在英国，一家公众有限公司的合法公司名称末尾中必须有“public limited company”或“PLC”、“plc”的字样。不过威尔士的一些公司会选择用“ccc”（公众有限公司威尔士语“cwmni cyfyngedig cyhoeddus”的缩写）结尾。

A public limited company (legally abbreviated to plc) is a type of public company (publicly held company) under United Kingdom company law, some Commonwealth jurisdictions, and the Republic of Ireland. It is a limited (liability) company whose shares may be freely sold and traded to the public (although a plc may also be privately held, often by another plc), with a minimum share capital of £50,000 and the letters PLC after its name. Similar companies in the United States are called publicly traded companies.