联合抵押条款（union mortgage clause）是保险单中的条款，规定如果保险人应向被保险不动产的抵押权人支付保险金，那么除了抵押权人、抵押权人的代理人或依抵押权人指令行使请求权的人之外，任何人的作为或不作为不能影响抵押权人就该不动产之损失获得赔偿的权利。例如，附有向抵押权人补偿损失的追加书的火灾保险单中即有联合抵押条款。此条款在保险人和抵押权人之间设立了独立的契约。

为了更好的理解该词，以下是其英文释义：A standard mortgage clause (also called a union mortgage clause) is an insurance provision that covers the mortgage lender but not the borrower for a loss involving the mortgaged property. This clause protects the lender in the event that the borrower intentionally damages the property.

和联合抵押条款相对照的是敞口抵押条款〔open mortgage clause〕，后者仅规定在抵押权人的利益可以显现时应向其支付保险金，并且后者之抵押权人仅仅是被指定的就其利益程度接受金钱损失赔偿的财产受益人。该词的英文释义为：Open mortgage clause is a provision in an insurance policy which exempts a mortgagee’s interest in a property in any case where the mortgagor tries to invalidate the policy. For example, a mortgagor commits fraud and the policy gets invalidated then in such cases the mortgagee’s interest also gets invalidated. This clause is also known as simple mortgage clause. The purpose of this clause is to provide payment first to the mortgagee to the extent of his/her interest.

双语例句：

（1）Subject to Section 165 of the Ordinance, if any Director or other person shall become personally liable for the payment of any sum primarily due from the Company, the Directors may execute or cause to be executed any union mortgage, charge, or security over or affecting the whole or any part of the assets of the Company by way of indemnity to secure the Director or person so becoming liable as aforesaid from any loss in respect of such liability.

在该条例第 165 条之限制下，倘若任何董事或其他人士须个人承担主要由本公司结欠之任何款项，董事可透过偿保证方式签立或促成签立任何有关或影响本公司全部或任何部分资产之联合抵押、押记或保证，以确保因上文所述事宜而须负责之董事或人士毋须就该等责任蒙受损失。

（2）To sell, exchange, union mortgage, charge, let on rent, share of profit, royalty or otherwise, grant licences, easements, options, servitudes and other rights over, and in any other manner deal with or dispose of, all or any part of the undertaking, property and assets (present and future) of the Company for any consideration and in particular (without prejudice to the generality of the foregoing) for any securities.

出售、交换、联合抵押、质押、出租、分享溢利、使用费或其他、授予特许、地役权、购股权、使用权及与此有关之其他权利，及以任何其他方式处理或处置本公司所有或任何部分之业务、物业及资产（现有及未来），以换取任何代价，尤其是（在不损及上述各项之一般性原则下）任何证券。