Lord Vishnu is one of the principal Hindu deities (regarded as “the preserver”), and with Brahma “the creator” and Shiva “the destroyer”, constitutes the well-known tri-murti or triad of Hinduism. The Vaishnava sect of Hinduism considers him to be the foremost deity, worthy of total devotion and reverence. This article discusses three mantras for Lord Vishnu – guru mantra, mantra for invocation and mantra for meditation.