亚他那修信经（或译亚大纳西信经、阿塔拿修信经、亚大纳修信经、亚大那西乌斯信经、亚达纳修信经、阿塔纳修斯信经；又称得救经），是传统基督教的三大信经之一，除有拉丁文版本外，尚有希腊文版本。此信经比另外两大信经在教义的阐述上更加清晰、详细及严谨，且直接引用许多圣经用语。

据说此信经是出自亚他那修（4世纪）之手，因而极具权威性。现代大多数的圣经研究学者认为此古信经最早曾在公元五世纪流传于高卢(Gaul)南部的拉丁教会中，但完整的则见于9世纪。在17世纪时，罗马天主教学者Voss已宣称此信经并非出于亚他那修之手，而文中更未使用亚他那修最为强调的「本体相同」（Homoousia）一词。自此此信经之作者巳无人确知。

The Athanasian Creed, or Quicunque Vult (also Quicumque Vult), is a Christian statement of belief focused on Trinitarian doctrine and Christology. The Latin name of the creed, Quicunque vult, is taken from the opening words, "Whosoever wishes". The creed has been used by Christian churches since the sixth century. It is the first creed in which the equality of the three persons of the Trinity is explicitly stated. It differs from the Nicene-Constantinopolitan and Apostles' Creeds in the inclusion of anathemas, or condemnations of those who disagree with the creed (like the original Nicene Creed).