加拉太书 (迦拉达书)（希腊语：ΠΡΟΣ ΓΑΛΑΤΑΣ）是圣经全书第48卷书，新约中的第9卷书。为使徒保罗写给加拉太早期基督徒社区的一封信。学者们认为此地点可能是安那托利亚南部的加拉太行省，或是加拉太人(凯尔特人的一支)所认为的安那托利亚中部。保罗在这封信里主要关注的议题是这些公元一世纪的外邦基督徒(非犹太人的信徒)，是否要遵守摩西律法。保罗认为这些初代加拉太信徒不需要遵守摩西律法的规条，尤其是割礼，在基督启示的光照下将这些规条处境化。加拉太书对基督教历史、基督教神学的发展，以及对使徒保罗的研究都有相当巨大的影响。

The Epistle to the Galatians, often shortened to Galatians, is the ninth book of the New Testament. It is a letter from Paul the Apostle to a number of Early Christian communities in Galatia. Scholars have suggested that this is either the Roman province of Galatia in southern Anatolia, or a large region defined by an ethnic group of Celtic people in central Anatolia. Paul is principally concerned with the controversy surrounding Gentile Christians and the Mosaic Law during the Apostolic Age. Paul argues that the Gentile Galatians do not need to adhere to the tenets of the Mosaic Law, particularly circumcision, by contextualizing the role of the law in light of the revelation of Christ. Galatians has exerted enormous influence on the history of Christianity, the development of Christian theology, and the study of the apostle Paul.