In finance, the term cosigner denotes a person (or other entity) which shares equal responsibility for a loan or line of credit alongside the primary borrower (the signer).

For example, a person with good creditworthiness may act as a guarantor in order to help an entity obtain a personal loan or credit card in spite of poor creditworthiness by co-signing the loan application.

In Switzerland, it is common for landlords to allow a third party to acts as a cosigner and guarantor of a rental housing agreement. In this arrangement, the cosigner assumes liability to cover any rental payments which are not covered by the renter in keeping with the contract.

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