The Emirate of Nejd is the second Saudi state, existing during the early to late 19th century.

Saudi rule is restored to central and eastern Arabia after having previously been brought down by an Ottoman-Egyptian invasion in 1818.

Compared to the First Saudi State, the second Saudi period is marked by less territorial expansion and less religious zeal, although the Saudi leaders continue to go by the title of Imam and still employ Wahhabist religious scholars.It is also marked by severe internal conflicts within the Saudi family, eventually leading to the dynasty's downfall.

Turki ibn Abdallah's reconquest of Riyadh from Egyptian forces in 1824 is generally regarded as the beginning of the Second Saudi State, while the end is marked by the Battle of Mulayda in 1891, between the forces loyal to the last Saudi imam, Abdul Rahman ibn Faisal ibn Turki, and the Al Rashid dynasty of Ha'il.