|Leo (left) and Inez Wong (right)|
|Profession||Owner of the Wong Ranch, Husband, Father, Father-in-law, Adoptive Maternal Grandfather|
|Relatives|| Wife: Inez Wong|
Daughter: Amy Wong
Son-in-law: Kif Kroker
Unknown number of Adopted Grandchildren: Kif Kroker's offspring
|First appearance||A Flight To Remember|
|Voiced by||Billy West|
Leonard "Leo" Wong (born May 19, 2952) is the father of Amy Wong and the husband of Inez Wong. Together with his wife, he owns the Wong Ranch and the entire western hemisphere of Mars, which his ancestor Sir Reginald Wong bought from Martians in exchange for a single bead. As well as meddling in Amy's love-life with his wife. He is completely blunt and has very few social skills, he always speaks his mind which always enrages people he doesn't buy off. He teases Amy about being fat. He also makes jokes about how she was fat when she was younger which pressured her into losing weight.  He couldn't care less about the environment and possibly endangered species. Wong planned to bulldoze 12% of the milky way for his golf course without any regard to any life he may destroy to do it. It is thanks to him that some parts of Saturn's rings are missing.
Leo is also the father-in-law of Kif Kroker (Amy's lover/Smizmar and FonFon Ru).
Leo is mostly shown as a selfish and greedy man who would cause catastrophes just for the sake of making money. He is also very cranky and attempts to manipulate his daughter, Amy's future for his own benefit.
- A Flight to Remember
- Mars University
- The Luck of the Fryrish
- Where the Buggalo Roam
- Kif Gets Knocked Up a Notch
- Teenage Mutant Leela's Hurdles
- Möbius Dick
- The Sting
- A Farewell to Arms
- Viva Mars Vegas