Kei Nagase can refer to:
- Kei Nagase (AC2), one of the selectable wingmen in Ace Combat 2 and its remake Ace Combat: Assault Horizon Legacy, who makes a cameo appearance in Ace Combat 04: Shattered Skies.
- Kei Nagase, an Ouroboros member in Ace Combat 3: Electrosphere.
- Kei Nagase (AC5), one of the player's wingmen in Ace Combat 5: The Unsung War, who also makes an appearance in Ace Combat 7: Skies Unknown.
- A minor character who appears in Ace Combat: Assault Horizon, bearing resemblance to Kei Nagase from Ace Combat 5. See Easter Eggs.
- Kei Nagase, the mascot of Project Nagase, an official news blog dedicated to Ace Combat: Assault Horizon.
- Kei Nagase, one of the main characters of the novel Ace Combat: Ikaros in the Sky.
- Nagase, one of the members of Ridgeback Squadron.
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