Jonathan J. Gilbert (born April 28, 1967) is an American former television and film actor known for his role as Willie Oleson on the TV series Little House on the Prairie.

[2] In Melissa Gilbert's autobiography, she wrote that when Jonathan was 18, he moved away from California and she had no relationship with him since then, for reasons supposedly unknown to her.

[3] He reunited with his sister, Melissa, and the cast of Little House for the 50th anniversary reunion of the show in Simi Valley on March 22, 2024.

[4] Gilbert is best known for his performance as Willie Oleson on the NBC TV series, Little House on the Prairie, from 1974 to 1983.

[5] He is also one of only six actors on Little House on the Prairie to appear throughout the entire series, along with Melissa Gilbert, Katherine MacGregor, Richard Bull, Kevin Hagen, and Dabbs Greer.