No, the Book of Acts is not in the Old Testament; it is part of the New Testament in the Christian Bible.
The Old Testament consists of texts that were written before the birth of Jesus Christ, encompassing the history, poetry, and prophecies of the Hebrew Scriptures. In contrast, the Book of Acts, often referred to as the Acts of the Apostles, documents the early Church’s history and the spread of Christianity after Jesus’ resurrection and ascension, focusing on the works of the apostles, particularly Peter and Paul.
Acts serves as a bridge between the Gospels and the Epistles, providing context to the foundational events of the Christian faith that unfolded after the Old Testament era. Thus, while both testaments are crucial for understanding the Christian faith, Acts is distinctly a New Testament text.