Karma Yoga is a book of lectures by Swami Vivekananda. It was published in February 1896 in New York City. Swami Vivekananda delivered a number of lectures in his rented rooms at 228 W 39th Street in New York City from December 1895 to January 1896. In 1895 friends and supporters of Swami Vivekananda hired Goodwin, a professional stenographer, who transcribed some of the lectures which were later published as this book. Goodwin later became a follower of Vivekananda.

The main topic of the book was Karma (work) and Karma Yoga. Swami Vivekananda discussed the concept of Karma in the Bhagavada Gita. Swami Vivekananda described Karma Yoga as a mental discipline that allows a person to carry out his/her duties as a service to the entire world, as a path to enlightenment.

It teaches that a spiritual seeker should act according to dharma, without being attached to the fruits or personal consequences. Karma Yoga, states the Bhagavad Gita, purifies the mind. It leads one to consider dharma of work, and the work according to one's dharma, doing god's work and in that sense becoming and being "like unto god Krishna" in every moment of one's life.

Vivekananda was born into an aristocratic Bengali Kayastha family of Calcutta, Vivekananda was inclined towards spirituality. He was influenced by his guru, Ramakrishna, from whom he learnt that all living beings were an embodiment of the divine self; therefore, service to God could be rendered by service to humankind. After Ramakrishna's death, Vivekananda toured the Indian subcontinent extensively and acquired first-hand knowledge of the conditions prevailing in British India. He later travelled to the United States, representing India at the 1893 Parliament of the World's Religions. Vivekananda conducted hundreds of public and private lectures and classes, disseminating tenets of Hindu philosophy in the United States, England and Europe. In India, Vivekananda is regarded as a patriotic saint, and his birthday is celebrated as National Youth Day.