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Subay' (Arabic: سبيع, also spelled Sbay', Sbei', and Subei) are a Sunni Muslim tribe of central Saudi Arabia. The tribe is of North Arabian (Adnanite) stock, and traces its lineage to the large, ancient tribe of Banu 'Amir, also known as 'Amir ibn Sa'sa'a, who came to dominate Nejd in the medieval period.
At the turn of the 20th century the tribe comprised both nomadic (bedouin) and sedentary sections. The original grazing lands of the tribe's bedouins had been the region of Ranyah and Kurmah, on the border between Nejd and 'Asir. The tribe ended up roaming the areas of central Nejd around Riyadh, along with the closely related tribe of the Suhool. Some sections, though, moved further north, where they later established the town of Rumah. Today, they are mostly found in Kuwait, Saudi Arabia, Qatar, United Arab Emirates, Jordan and Iraq. Few members have migrated to Syria, Palestine and Egypt.
The sedentary members of the tribe, on the other hand, have mostly resided in Nejd for centuries, a possible legacy of Banu 'Amir's heyday. Families that belong to Subay' can be found in practically every town in the region, making up a disproportianate amount of Nejd's traditional sedentary population.
Subaie's population is nearly 800.000-1.000.000 people all around central and north of the Arabian Peninsula, located in the Middle East.