How to Say "rulebook" in Spanish
The Spanish word for “rulebook” is “reglamento” — B1 level. This is a very common word in everyday Spanish.

Examples
Debes leer el reglamento antes de empezar a trabajar.
You must read the regulations before starting to work.
El árbitro aplicó el reglamento estrictamente durante el partido.
The referee applied the rulebook strictly during the match.
Estamos redactando el nuevo reglamento interno de la empresa.
We are drafting the company's new internal regulations.
Regla vs. Reglamento
While 'regla' usually refers to a single rule, 'reglamento' refers to the entire collection or document containing all the rules for a specific place or activity.
Gender Clue
Notice the '-miento' ending? Almost all Spanish words ending in '-miento' are masculine, so we always say 'el reglamento' and 'los reglamentos'.
The 'Ruler' Mistake
Mistake: “Using 'reglamento' to talk about a tool for drawing straight lines.”
Correction: Use 'regla' for the tool you use in geometry. 'Reglamento' is only for written rules.
Related Translations
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