o-Anisaldehyde, also known as 2-methoxybenzaldehyde, is an aromatic aldehyde with the molecular formula C9H10O2. It features a methoxy group (-OCH3) positioned ortho to the aldehyde functional group (-CHO) on an aromatic ring. This compound is notable for its pleasant, sweet aroma and is commonly utilized in the fragrance industry, as well as in organic synthesis. In addition to its applications in perfumery, o-anisaldehyde serves as an important intermediate in the production of pharmaceuticals, agrochemicals, and various fine chemicals, making it a substance of interest in both industrial and research settings.