圣罗勒（学名：Ocimum sanctum，异名Ocimum tenuiflorum），又名神罗勒，为唇形科罗勒属下的一个植物种。

Ocimum tenuiflorum, also known as Ocimum sanctum, holy basil, or tulasi (also spelled thulasi), is an aromatic plant in the family Lamiaceae which is native to the Indian subcontinent and widespread as a cultivated plant throughout the Southeast Asian tropics. It is an erect, many-branched subshrub, 30–60 cm (12–24 in) tall with hairy stems and simple phyllotaxic green or purple leaves that are strongly scented.