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- IFAB: initialism for the International Football Association Board, the body that determines the Laws of the Game of association football.
- Indirect free kick: type of free kick. Unlike in a direct free kick, a goal may not be scored directly from the indirect kick.
- Indoor football: see six-a-side football.
- Indoor soccer: see six-a-side football.
- Injury time: see stoppage time.
- Inside forward: position employed in a 2–3–5 formation. The inside forwards played just behind the centre forward, similar to the modern attacking midfielder or second striker.
- Intercept: to prevent a pass from reaching its intended recipient.
- International break: period of time set aside by FIFA for scheduled international matches per their International Match Calendar. Also known as FIFA International Day/Date(s).
- International clearance: clearance required from foreign or overseas football associations before the transfer of a player can be completed where that player is moving across national or international borders.
Read more about this topic: Association Football Terminology