A Gym Leader (Japanese: ジムリーダー Gym Leader) is the highest ranking member of a Pokémon Gym. If a trainer defeats a Gym Leader in battle, then the trainer earns that Gym's Badge.

Although similar in nature, Frontier Brains are not considered Gym Leaders and are thus not included in this list.

Indigo League

Gym Leader	City	Type	Badge
Brock	Pewter City	Rock	Boulderbadge
Misty	Cerulean City	Water	Cascadebadge
Lt. Surge	Vermilion City	Electric	Thunderbadge
Erika	Celadon City	Grass	Rainbowbadge
Koga/Janine	Fuchsia City	Poison	Soulbadge
Blaine	Cinnabar Island	Fire	Volcanobadge
Sabrina	Saffron City	Psychic	Marshbadge
Giovanni/Blue	Viridian City	Ground/Misc.	Earthbadge

Orange League

Gym Leader	Island	Badge
Cissy	Mikan Island	Coral Eye Badge
Danny	Navel Island	Sea Ruby Badge
Rudy	Trovita Island	Spike Shell Badge
Luanna	Kumquat Island	Jade Star Badge

Johto League

Gym Leader	City	Type	Badge
Falkner	Violet City	Flying	Zephyrbadge
Bugsy	Azalea Town	Bug	Hivebadge
Whitney	Goldenrod City	Normal	Plainbadge
Morty	Ecruteak City	Ghost	Fogbadge
Chuck	Cianwood City	Fighting	Stormbadge
Jasmine	Olivine City	Steel	Mineralbadge
Pryce	Mahogany Town	Ice	Glacierbadge
Clair	Blackthorn City	Dragon	Risingbadge

Hoenn League

Gym Leader	City	Type	Badge
Roxanne	Rustboro City	Rock	Stonebadge
Brawly	Dewford Town	Fighting	Knucklebadge
Wattson	Mauville City	Electric	Dynamobadge
Flannery	Lavaridge Town	Fire	Heatbadge
Norman	Petalburg City	Normal	Balancebadge
Winona	Fortree City	Flying	Featherbadge
Tate & Liza	Mossdeep City	Psychic	Mindbadge
Wallace/Juan	Sootopolis City	Water	Rainbadge