圣公宗（英语：Anglicanism，音译安立甘宗），是源自英国（英格兰）的英格兰国教会和爱尔兰教会及其于世界各地衍伸出来的教会之总称。目前世界上的圣公宗教徒约有7300万人（2008年）。

圣公宗，英文原名「Anglican」，意译是英式教会，形容制度、教会、礼仪传统和神学思想，是从英格兰的国教——英格兰教会所衍生而来的教会，成为普世圣公宗。这个词语亦可形容其他采用圣公宗的其他教会，他们因为与坎特伯里大主教共融而成为普世圣公宗的一员。由于「Anglican」一词与盎格鲁人一词词型较为相近，有时会被误认为是民族名称而非宗派名称，因此在美国及苏格兰等的强调圣公会非英格兰民族特性的地区，改以「The Episcopal Church」自称，用「Episcopalian」称呼其成员。「Episcopal」意思为主教制的。普世华人、韩国及日本基督徒都使用「圣公会」为公用名称。

Anglicanism is a tradition within Christianity comprising the Church of England and churches which are historically tied to it or hold similar beliefs, worship practices and church structures. The word Anglican originates in ecclesia anglicana, a medieval Latin phrase dating to at least 1246 that means the English Church. Adherents of Anglicanism are called Anglicans. The great majority of Anglicans are members of churches which are part of the international Anglican Communion. There are, however, a number of churches that are not within the Anglican Communion which also consider themselves to be Anglican, most notably those referred to as Continuing Anglican churches, and those which are part of the Anglican realignment movement.