Basil essential oil (Ocimum basilicum) is an aromatic oil obtained from the leaves and flowering tops of a plant associated with the Lamiaceae family and Tropical Asia and regions of the Mediterranean. It is known for its fresh, green, sweet-herbaceous, and lightly spicy with a bright anise nuance. and is used in perfumery, diffuser blends, and other traditional aromatic preparations.

Basil essential oil is commonly used in brightening diffuser blends, focus formulas, and fresh household aromas. Different chemotypes can vary significantly, so the precise botanical type and constituent profile should be checked before use, especially for topical products.

This oil is especially appreciated for its tarragon-style blending potential and is usually used in small amounts because its scent profile can strongly shape the finished aroma.