Whit or Pentecost Monday is the holiday celebrated the day after Pentecost. It is also known as Monday of the Holy Spirit.

It is known simply as "the second day of Pentecost" or "the second Whitsun".

In the Eastern Orthodox Church Whit Monday is known as "Monday of the Holy Spirit" or "Day of the Holy Spirit" and is the first day of the afterfeast of Pentecost, being dedicated specifically to the honor of God the Holy Spirit.