Bill Rizer may refer to:
- Bill Rizer, the original timeline character and one of the two main protagonists of the Contra series.
- Bill Rizer (clone), the clone of Bill Rizer, appearing as one of the main protagonists of Neo Contra and Contra ReBirth.
- Bill Rizer (Returns), the character from Contra Returns, taking place in its own universe.
- Bill Rizer (Metal Storm), Bill equipped with the Metal Storm Armor, which enables him to equip more powerful firearms and become stronger.
- Bill Rizer (Shin Contra Oathkeeper), an even stronger version of Bill who fights for truth and justice.
- Bill Rizer (Operation Galuga), an incarnation of Bill appearing in Contra: Operation Galuga.
- Bill Bomber, the character from Super Bomberman R, based on the original Bill Rizer.
- Lance Gryzor, a rename of Bill Rizer for Gryzor, the initial title the first Contra game was released as in the PAL region for arcade and home computers before being rebranded to Probotector. He has his own background and story.
- Master Contra, the main antagonist of Neo Contra who proclaims himself to be the original Bill Rizer due to possessing his consciousness.
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