Jumborg Ace is a fictional mecha created by Tsuburaya Productions, and the titular fighting robot of the 1973 Tokusatsu television series. Jumborg Ace is actually an airplane that can transform into a fighting robot, which is piloted by Naoki Tachibana.

The year after his series, Jumborg Ace appeared in a Japanese/Thai coproduction, Jumborg Ace & Giant.

Young air delivery boy Naoki Tachibana is out to deliver a package for his grumpy boss Daisaku Banno, when his older brother Shin'ya (Toshiaki Amada), who commanded the defense force, PAT (Protective Attacking Team), was killed in an attack by a giant monster called King Jyglus (which was sent by the evil alien Anti Go-Ne of the Planet Groth). When PAT retaliates against a second attack by the monster, Naoki, in retaliation for his brother's death, suicidally tries to ram his air delivery Cessna into the monster, to their shock.

Jumborg Ace has a vast array of powers, including a sword coming from his stomach, missiles, and energy beams. He can cut enemies' heads off with a kick or change his body into a slicing machine. He can also transfer energy from his eyes if Jumborg 9 is out of power.