Who wrote St Mark's Gospel?

Answer 1

Mark the Evangelist is the traditional author of the Gospel of Mark.

Another Answer

The writer of the Gospel of Mark is deemed normally to be the man known in the New Testament as John Mark. This is the person referred to in the verse below:

Acts 12:25 (King James Version): And Barnabas and Saul returned from Jerusalem, when they had fulfilled their ministry, and took with them John, whose surname was Mark.

Apart from the fact that there is no evidence which contradicts the Markan authorship, there is also concrete positive concrete evidence from external sources supporting it. Papias indicates that Mark got much of his information from the disciple Peter, although he certainly used other sources. The Aramaic coloring of some of Mark's work demonstrates his Jewish background. Others have suggested he also made use of what is referred to as 'Aramaic Matthew', the first Gospel of Matthew, written in Aramaic which is now lost. Whatever were his sources, there is no reason to doubt the attribution to him.

Answer from Wikipedia

"The gospel itself is anonymous."

Answer 2

The Gospel known to us as the Gospel According to St Mark or St Mark's Gospel does not identify its author. It was not until the second century that an attempt was made to assign an author to the Gospel, when it was attributed by the Church Fathers to the Apostle Mark, thus giving this previously anonymous Gospel the name "Gospel According to St Mark". Eusebius (Ecclesiastical History, 3.39) says that it was Papias, bishop of Hieropolis in Asia Minor (ca.130), who named Mark as the author of the gospel and the 'interpreter' of Peter. It seems likely that he was influenced by the first epistle of Peter, a pseudonymous document from the second century, where a Mark is mentioned as Peter's son (l Peter 5:13). Since 1 Peter is now known not to have really been written by the apostle Peter, this just adds another level of unsupported conjecture to the quest for the author of Mark's Gospel.

There is no real evidence to support Papias' opinion, and we therefore do not know who wrote Mark's Gospel.