Najran (Arabic: نجران‎ Naǧrān), formerly known as Aba as Sa'ud, is a city in southwestern Saudi Arabia near the border with Yemen. It is the capital of Najran Province. Designated a New town, Najran is one of the fastest-growing cities in the kingdom; its population has risen from 47,500 in 1974 and 90,983 in 1992 to 246,880 in 2004 and to 1200000 in 2011. The population belongs mostly to the ancient tribe of Yam.

Due to its long history, the inhabitants of Najran are made up of many races, religions and backgrounds. Islam is the religion of all of the Najranis, with Ismaili Shia forming the plurality of the religious adherents. Hanbali, Shafii and Maliki Sunnis form the second largest ethno-religious group in the city, while Zaydi Shia froms the smallest ethno-religious group.

Najran in Arabic has at least two meanings. It is a term used to describe the wooden frame on which a door opens and is also a synonym for thirsty. Local tradition also has it that the land derived its name from the first man to settle in the area, Najran ibn Zaydan ibn Saba ibn Yahjub ibn Yarub ibn Qahtan.