Regret may refer to the following:
- Prophet of Regret - The San'Shyuum Hierarch during the Human-Covenant war.
- Regret's Carrier - The Prophet of Regret's personal Assault Carrier.
- Regret's Fleet - The Prophet of Regret's personal fleet.
- Regret (achievement) - An achievement in Halo 2 Vista that is worth 30 gamerpoints and requires the player to complete Regret on Normal or higher.
- Regret (level) - The ninth campaign level in Halo 2 which requires the player to kill the Prophet of Regret.
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