The Indigo League (Japanese: セキエイリーグ Sekiei League, lit. Quartz League) is the regional Pokémon League of the Kanto region. It consists of a network of eight Gyms and the Elite Four. Depending on the context, the Indigo League can also be called the Kanto League or simply the Pokémon League.

Pokémon trainers who earn eight Gym Badges from sanctioned Indigo League Gyms qualify to participate in Indigo League competitions, one of which is the Indigo Plateau Conference.

The Johto League and Indigo League share a single Elite and Champion; eight Badges from either region will allow a trainer to battle the Elite Four.

Gym Leaders of the Indigo League

Generation I and Generation III

• Brock, Rock-type Gym Leader of the Pewter City Gym
• Misty, Water-type Gym Leader of the Cerulean City Gym
• Lt. Surge, Electric-type Gym Leader of the Vermillion City Gym
• Erika, Grass-type Gym Leader of the Celadon City Gym
• Koga, Poison-type Gym Leader of the Fuchsia City Gym
• Blaine, Fire-type Gym Leader of the Cinnabar Island Gym
• Sabrina, Psychic-type Gym Leader of the Saffron City Gym
• Giovanni, Ground-type Gym Leader of the Viridian City Gym

Generation II

• Brock, Rock-type Gym Leader of the Pewter City Gym
• Misty, Water-type Gym Leader of the Cerulean City Gym
• Lt. Surge, Electric-type Gym Leader of the Vermillion City Gym
• Erika, Grass-type Gym Leader of the Celadon City Gym
• Janine, Poison-type Gym Leader of the Fuchsia City Gym
• Blaine, Fire-type Gym Leader of the Cinnabar Island Gym
• Sabrina, Psychic-type Gym Leader of the Saffron City Gym
• Blue, Gym Leader of the Viridian City Gym

Elite Four and Champion of the Indigo League

Generation I and Generation III

• Lorelei, Ice-type Elite
• Bruno, Fighting-type Elite
• Agatha, Ghost-type Elite
• Lance, Dragon-type Elite
• Blue, Champion

Generation II

• Will, Psychic-type Elite
• Bruno, Fighting-type Elite
• Koga, Poison-type Elite
• Karen, Dark-type Elite
• Lance, Champion