Neville Longbottom is a fictional character in J.K. Rowling's Harry Potter book series. He is described as a round-faced Gryffindor student in Harry's year. Throughout the series, he is often portrayed as a bumbling and disorganised character, and a rather mediocre student (though he is highly gifted at Herbology). However, the character's personality appears to undergo a transition after he joins Dumbledore's Army in Harry Potter and the Order of the Phoenix. The encouragement he receives gives him confidence in his magical abilities, turning him into a more competent wizard. As the series progresses, he becomes close friends with Harry, Ron, Hermione, Ginny, and Luna.
Neville has been played by Matthew Lewis in all of the Harry Potter films to date.