A twin flame is a concept in New Age spirituality describing the belief that a single soul can be split into two bodies, resulting in two individuals who share an unusually intense spiritual and emotional bond. Proponents describe twin flames as "mirror souls", whose reunion is understood as a catalyst for personal growth, healing, and spiritual awakening. The concept is discussed primarily within spiritual and self-help contexts and has no documented scientific basis.

Though the idea draws on ancient philosophical traditions, the specific term was introduced in Victorian literature and popularized in the late 20th century through New Age religious movements. The twin flame concept is distinct from the related notion of a soulmate.

In twin flame belief, two people are thought to share an intense spiritual or emotional bond, often described by adherents as a deep connection between their souls.^[1] Proponents often describe twin flames as "mirror souls" or as "two halves of the same soul" incarnated separately and destined to reunite.^[2]

Believers typically associate twin-flame relationships with strong recognition, emotional intensity, personal transformation, and spiritual growth. Popular accounts often distinguish the concept from ordinary romantic relationships or soulmate relationships by emphasizing the connection's perceived intensity and transformative purpose.^[3]

Descriptions of twin-flame relationships in mainstream sources often outline a series of phases. There is an initial period of intense attraction or recognition, followed by a shift into emotional turbulence or conflict that adherents interpret as an opportunity for individual healing or self-development.^[1] Others believe that once you heal the inner conflict, twin flames come together.^{[citation needed]}

Several outlets, including Medical News Today, describe a 'runner–chaser' dynamic as a recurring stage within twin-flame relationships, in which one partner withdraws emotionally or physically, while the other attempts to resolve the conflict. The website describes a subsequent stage in which both individuals become more open to vulnerability, work through their differences, and begin to heal from past traumas.^[1]

• Twin Flames Universe