DEFINITION of 'Endorser'

A person who is authorized to sign a negotiable security in order to transfer ownership from one party to another, or to approve the terms and conditions of a contract. Endorsing a check before it is cashed or deposited is the most common and widely known example, but an endorser is also required to complete such transactions as transferring a car title or trading a financial security.


Most people endorse a check to cash it, deposit it or sign it over to someone else. Signatures are usually required on the back of a check or financial instrument. Incorrectly endorsing a check can result in the bank returning the check to the issuer.