The Hebrew Gospel hypothesis (or proto-Gospel hypothesis or Aramaic Matthew hypothesis) is a group of theories based on the proposition that a lost gospel in Hebrew or Aramaic lies behind the four canonical gospels. It is based upon an early Christian tradition, deriving from the 2nd century bishop Papias of Hierapolis, that the apostle Matthew composed such a gospel. Papias appeared to say that this Hebrew or Aramaic gospel was subsequently translated into the canonical gospel of Matthew, but modern studies have shown this to be untenable. Modern variants of the hypothesis survive, but have not found favour with scholars as a whole.
The idea that some or all of the gospels were originally written in a language other than Greek begins with Papias of Hierapolis, c. 125–150 CE. In a passage with several ambiguous phrases, he wrote: "Matthew collected the oracles (logia – sayings of or about Jesus) in the Hebrew language (Hebraïdi dialektōi — perhaps alternatively "Hebrew style") and each one interpreted (hērmēneusen — or "translated") them as best he could." By "Hebrew" Papias would have meant Aramaic, the common language of the Middle East beside koine Greek On the surface this implies that Matthew was originally written in Hebrew (Aramaic), but Matthew's Greek "reveals none of the telltale marks of a translation."