The Saudi–Yemen barrier (Arabic: الجدار السعودي اليمني) is a physical barrier constructed by Saudi Arabia along part of its 1,800-kilometer (1,100 mi) border with Yemen. It is a structure made of pipeline three metres (10 ft) high filled with concrete, acting as a "security barrier along sections of the now fully demarcated border with Yemen" and fitted with electronic detection equipment.

Construction of the barrier began in September 2003 in order to counter infiltrations and terrorism. When construction of the 75-kilometer (47 mi) barrier by the Saudis began, the Yemeni government strongly objected, stating that it violated a border treaty signed in 2000. Thus, Saudi Arabia agreed to stop construction in February 2004.