Cuminaldehyde (4-isopropylbenzaldehyde) is a natural organic compound with the molecular formula C<sub>10</sub>H<sub>12</sub>O. It is a benzaldehyde with an isopropyl group substituted in the 4-position.
Cuminaldehyde is responsible for the characteristic aroma of cumin seed. It has an intense aroma described as "spicy, cumin, green, herbal". Cuminaldehyde is a precursor to another commercially important fragrance, cyclamen aldehyde.
Cuminaldehyde has been investigated for inhibition of the fibrillation of alpha-synuclein,
Cuminaldehyde can be prepared synthetically by the reduction of 4-isopropylbenzoyl chloride or by the formylation of cumene.