ANSWER: There are at least SEVENTEEN appearances of angels listed in the Gospel accounts and the rest of the New Testament.
An angel appears to Zacharias the priest declaring he will have a son to be named John (John the Baptist).
11. Then an angel of the Lord appeared to him . . . Fear not, Zacharias, because your supplication has been heard; and your wife Elizabeth shall bear a son to you . . . (Luke 1:11 - 12)
An angel from God tells a virgin named Mary she will give birth to the savior of mankind (Luke 1:26-28, 30-31). Joseph receives at least three separate visits from angels - one regarding marrying Mary and to concerning the protection of baby Jesus (Matthew 1:18-20, 2:12-13, 19-21) They also appeared twice to shepherds near Bethlehem regarding the birth of Jesus (Luke 2:8-11, 13-14). One of the angelic host came and ministered to Jesus after his temptation by the devil (see Matthew 4)
From time to time an angel would stir the water in the pool of Bethesda. The first person to enter the pool after the angel stirred it would be healed of their diseases (John 5:1-4). God also sent an angel to Jesus to strengthen him before his suffering and death.
When He came to the place, He said to them, "Pray that you may not enter into temptation." . . . Then an angel appeared to Him from heaven, strengthening Him." (Luke 22:39, 43)
An angel appears twice near Jesus' tomb declaring he has already risen from the dead (Matthew 28:1-2, 5 - 6, (Mark 16:5 - 6). Two angels declare to the disciples, right after Jesus ascends to heaven, that he will return to the earth in the same way they saw him leave (Acts 1:10 - 11).
An angel frees the apostles from prison (Acts 5:17 - 20) and also appears to a Gentile named Cornelius telling him to send for the apostle Peter.
1. Now there was in Caesarea a certain man named Cornelius . . . 3. He clearly saw in a vision, about the ninth hour of the day, an angel of God coming to him and saying to him, "Cornelius" . . . And now send men to Joppa, and call for Simon who is surnamed Peter. (Acts 10:1, 3, 5)
One of God's spiritual servants is sent to free Peter from prison.
5. As a result, Peter was securely held in the prison, but fervent prayer was made to God by the church for him.7. But suddenly an angel of the Lord stood by him, and a light shined in the building. And after striking Peter on the side, he roused him, saying, "Get up! Hurry!" And the chains fell off his hands (Acts 12).
Lastly, one of God's angels is sent to tell the apostle Paul that he and those with him on the ship will not lose their lives at sea (Acts 27:1 - 2, 21 - 24).