Laws vary from state to state, so it is advisable for you to check with your particular state to see whether or not you can notarize your spouse's signature. In most states there is no prohibition against it, however, notarizing a relative's or spouse's signature may be seen as a conflict of interest. The purpose of a notary is to be an independent witness to the signing of a document. If there
. were to be a dispute involving the document, the validity of the notarization could be called into question. Additionally, you may not notarize your own signature. For more information, please check with your state laws.