The Gospel does not name its writer
Mark opens by announcing the good news of Jesus Christ, rather than introducing its human author (Mark 1:1). Unlike some New Testament letters, it does not begin with a name or personal greeting. So the most careful answer is that the book itself does not explicitly say, “Mark wrote this.”
Yet Christians have traditionally called it the Gospel according to Mark. This does not mean the message is uncertain. Its focus is clear from the first line: Jesus is the centre of the story, and the book calls readers to see who he is and respond to him (Mark 1:1).
The beginning of the gospel of Jesus Christ, the Son of God;
Who was John Mark?
The man usually identified as the author is John Mark. Acts introduces him as John, also called Mark, and says believers gathered for prayer at the Jerusalem home of his mother, Mary (Acts 12:12). He was part of a real Christian community from its early days.
Mark later travelled with Barnabas and Saul, who is also known as Paul, when they left Jerusalem for ministry (Acts 12:25). On their first missionary journey, he assisted them for a time, though he later departed from the team in Pamphylia (Acts 13:5, Acts 13:13).
His relationships with Paul, Barnabas, and Peter
Mark’s early departure became a point of disagreement between Paul and Barnabas. Barnabas wanted to take Mark on another journey, while Paul did not think it wise, and the two leaders went separate ways (Acts 15:37-39). It is a refreshingly honest picture. Even devoted Christians sometimes have painful disagreements.
That was not the end of Mark’s story. Paul later calls him a fellow worker and says Mark was useful for ministry (Philemon 1:24, 2 Timothy 4:11). Paul also identifies him as a relative of Barnabas (Colossians 4:10). Mark’s life shows that a setback in service does not have to define someone forever.
Peter also refers to a man named Marcus as his son, most likely describing a close spiritual relationship rather than a biological one (1 Peter 5:13). This connection helps explain why the traditional attribution of the Gospel links Mark closely with Peter.
Only Luke is with me. Take Mark, and bring him with thee: for he is profitable to me for the ministry.
What can we say with confidence?
John Mark is the traditional and widely accepted answer to the question of who wrote Mark’s Gospel. Scripture clearly presents a John Mark who knew the early church, worked with Barnabas and Paul, and had a close bond with Peter (Acts 12:12, 1 Peter 5:13).
But the Bible does not directly tell us the exact process by which the Gospel was written, or say that Peter dictated it to Mark. It is wise not to claim more than Scripture says. Read Mark for yourself, notice its urgent movement from one event to another, and watch how it leads you to Jesus, his authority, his suffering, and his resurrection.