Endorsement (alternatively spelt indorsement) may refer to:
- Testimonial in advertising, written or spoken statement endorsing a product
- Political endorsement, the action of publicly declaring one's personal or group's support of a candidate for elected office
- a form added to an insurance policy, modifying the terms
- A signature on a negotiable instrument (such as a cheque), indicating a person's intent to become a party to the instrument
- Blank endorsement, such a signature, without indicating payee
- Notation made on a Driver's license