Subay' (, 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.