Contemporary yogis, evangelical Christians, and witches have incorporated essential oils and their aromas into practices as diverse as yoga, meditation, prayer, Bible reading, anointing, and spellcasting in the United States over the past forty years. These groups often view each other with alarm, yet they tread common ground in utilizing essential oils to intensify varied spiritual practices. This article answers two related questions. How do spiritually diverse practitioners justify using the same consumer products to amplify their practices, and why are essential oils considered sacred by these same consumers? Drawing from a diverse archive of essential oil use guides, marketing materials, and social media posts, I argue that spiritual “oilers” are (1) perennialists who mythologize ancient uses of scent to authenticate their postmodern embodied practices, and (2) essentialists who believe that essential oils contain universal, transcendent properties. Consequently, oilers’ beliefs and practices blur classifications between traditions and sharpen our attention to the importance of the sense of smell in contemporary spirituality. This project contributes to studies of spirituality and consumerism by offering a comparative analysis of how three groups use smell, via essential oils, to intensify their individual spiritual practices as well as their collective identities as oilers.