- Country: USA
- Genres: Drama, Horror, Thriller
- Release: 1974-10-23
- Director: Buzz Kulik
- Writers: Andrew Peter Marin , John Holbrook Vance
- Language: English
- Stars: Scott Jacoby , Pippa Scott , John Larch , Dabney Coleman , Kim Hunter , John Fiedler (I) (1925–2005) , Linda Watkins , Cindy Fisher , Cindy Eilbacher , Lisa Eilbacher
- Runtime: 74 min
- Awards: N/A
- AKA: Bad Ronald (Italy) , Bad Ronald (United Kingdom) , L'inquiétant Ronald (Canada) , Menneisyyden vanki (Finland) , Плохой Рональд , Stygge Roland (Sweden) , Bad Roland (Sweden) , Bad Ronald , Indespærret (Denmark) , Bad Ronald (United States of America) , Ronald el malo (Spain) , Bad Ronald (India)
- Plot: A shy teenager accidentally kills a mocking peer's equally mocking younger sibling, and his mother helps him hide in a spare room in their house. Problems arise when the mother goes for an operation and dies, and the house is sold to a new family, with the teen still living inside.
- IMDB:tt0071186
Bad Ronald Cast · · · ALL
Buzz Kulik
Director
Scott Jacoby
Ronald Wilby
Pippa Scott
Mrs. Wood
John Larch
Sgt. Lynch
Dabney Coleman
Mr. Wood
Kim Hunter
Elaine Wilby
John Fiedler
(I)
(1925–2005)
Mr. Roscoe
Cindy Fisher
Babs Wood
Cindy Eilbacher
Althea Wood
Lisa Eilbacher
Ellen Wood
Ted Eccles
Duane Matthews
Roger Aaron Brown
Sergeant Carter
Aneta Corsaut
Mrs. Matthews
Angela Hoffman
Carol Matthews
Karen Purcill
Wanda (as Karen Purcil)
Shelley Spurlock
Laurie Matthews
Lesley Woods
Aunt Margaret