Affiliate disclosure is legally required in the US (FTC) to inform audiences about affiliate relationships and potential commissions. Disclosure requirements: - Clear and conspicuous - Near affiliate links - Before first link preferred - Easy to understand - On every page with links Disclosure examples: - "This post contains affiliate links..." - "I may earn a commission..." - "Disclosure: Affiliate partner" FTC guidelines: - Must be noticeable - Can't be hidden - Plain language - Not just in T&C Best practices: - Prominent placement - Honest language - Consistent across content - Update as regulations change