Eckhart Tolle (/ˈɛkɑːrt ˈtɒlə/ EK-art TOL-ə; German: [ˈɛkhaʁt ˈtɔlə]; born Ulrich Leonard Tölle, February 16, 1948) is a spiritual teacher and best-selling author. He is a German-born resident of Canada best known as the author of The Power of Now and A New Earth: Awakening to Your Life's Purpose. In 2008, The New York Times called Tolle "the most popular spiritual author in the United States". In 2011, he was listed by Watkins Review as the most spiritually influential person in the world. Tolle is not identified with any particular religion, but he has been influenced by a wide range of spiritual works.

Tolle said he was depressed for much of his life until age 29 when he underwent an "inner transformation". He then spent several years wandering "in a state of deep bliss" before becoming a spiritual teacher. He moved to Vancouver, British Columbia in 1995 and currently divides his time between Canada and California. He began writing his first book, The Power of Now, in 1997 and it reached The New York Times Best Seller list in 2000.

The Power of Now and A New Earth sold an estimated three million and five million copies respectively in North America by 2009. In 2008, Tolle joined television talk show host Oprah Winfrey for 10 live webinars, and by October 2009 they had been accessed 35 million times. In 2016, Tolle was named in Oprah's SuperSoul 100 list of visionaries and influential leaders.