A third-party check is a two-party check that is endorsed to a third person. Normally, there are two parties to a check: A payer, who writes the check and a payee, who receives the check. The payee ...

If someone writes a check to you, you could write that check over to someone else instead of cashing it or depositing it into your bank. At that point, it becomes a third-party check. Third-party ...