Acts never says who wrote it. No line in the book reads “I, so-and-so, wrote this account.” The traditional answer, and still the most widely held one among scholars today, is Luke: a doctor who traveled with the apostle Paul and also wrote the Gospel that carries his name. That answer rests on clues inside the text plus a strong early church memory, not a signature.
One story in two volumes
Acts opens by addressing a man named Theophilus and referring back to “my former book,” which covered “all that Jesus began to do and teach.” That is a direct callback to the Gospel of Luke, which opens the same way, addressed to the same Theophilus. Scholars call the pair Luke-Acts: one long, two-part work split across two scrolls because a single scroll could not hold it all. The vocabulary, sentence structure, and habits of the Greek match closely enough between the two books that almost no one argues they came from different hands. Whoever wrote the Gospel wrote Acts. We’ve covered the same authorship puzzle across the whole Bible in who wrote the Bible, if you want the wider picture.
The “we” passages
Partway through Acts, the writing shifts. Most of the book describes events in the third person: Paul did this, the apostles said that. But starting in chapter 16, during part of Paul’s travels, the narration switches to “we.” “We sought to go into Macedonia” (Acts 16:10) reads like someone who was actually on the boat. These “we” sections come and go across several later stretches of the story, always tied to specific stretches of travel, not the whole book.
The classic reading takes this at face value: the author was there, traveling with Paul, and wrote himself into the story using the plural pronoun that comes naturally to an eyewitness. That is the strongest piece of internal evidence for authorship. A minority of scholars read it differently. Some think the “we” sections came from a separate travel source that the author folded into the larger narrative later. Others treat it as a literary convention common in ancient sea-voyage writing, meant to add a sense of realism rather than mark the author’s real presence. Neither reading has displaced the eyewitness explanation as the majority view, but both are live positions in current scholarship.
What the early church said
By the second century, church writers were naming Luke as the author of both books without much argument about it. Irenaeus, writing around AD 180, names him directly. The Muratorian fragment, an early list of accepted New Testament writings from around the same period, does too. Neither source reflects a debate being settled in real time. They reflect a name already fixed in memory, a hundred years or so after the books themselves were written.
That name matches someone the apostle Paul actually mentions. In Colossians 4:14, Paul sends greetings from “Luke, the beloved physician,” listing him among his traveling companions. Paul never says this Luke wrote anything. But the name, the profession, and the travel connection all point the same direction as the “we” passages and the early tradition.
Who was Theophilus?
Both books are addressed to Theophilus, and nobody knows for certain who he was. The name means “friend of God” or “loved by God,” which has led some readers to wonder if it stands in for any reader rather than one real person. Others think he was a Roman official or a patron who funded the writing and was addressed formally, the way ancient works often opened with a dedication to a sponsor. The text gives no last name, no city, no further clue.
When Acts was written
Acts ends abruptly, with Paul under house arrest in Rome, still waiting for his case to be heard. It never says how that trial ended, never mentions Paul’s death, and never mentions the fall of Jerusalem in AD 70, an event the book might be expected to reference given how much it cares about that city. Some scholars take that silence as a sign Acts was finished in the early 60s, close to when the story itself stops. Many others place it in the 70s or 80s, arguing the ending fits the shape of the story Luke wanted to tell rather than the date he happened to be writing. Neither date has won out, and both ranges show up regularly in current scholarship. If dating questions like this interest you, we lay out the timeline for the rest of scripture in when was the Bible written.
Where this leaves the story
Whoever wrote Acts was solving a real problem. The Gospels tell the story of Jesus. Paul’s letters assume a church that already exists in cities across the Roman world. Acts is the bridge between them: the account of how a small group in Jerusalem became a movement reaching Rome. It sits right at the seam of what we’ve elsewhere called the Old and New Testament, except here the seam runs between the Gospels and the letters instead.
Knowing that the writer likely traveled part of that road himself, sat in some of those rooms, and wrote down what he saw does not settle every question about the book. But it changes what kind of book you are reading: not a secondhand summary written from a distance, but at least in part, an eyewitness account.