Theosophy, in its modern presentation, is a spiritual philosophy developed since the late 19th century. Its major themes were originally described mainly (though not exclusively) by Helena Blavatsky (1831–91), co-founder of the Theosophical Society.

Broadly, Theosophy attempts to reconcile humanity's scientific, philosophical, and religious disciplines and practices into a unified worldview. As it largely employs a synthesizing approach, it makes extensive use of the vocabulary and concepts of many philosophical and religious traditions. However these, along with all other fields of knowledge, are investigated, amended, and explained within an esoteric or occult framework