Ritriti (kutoka Kiingereza "Retreat") ni kipindi cha kujishughulisha na maisha ya Kiroho kwa kujitenga na kazi na mazingira ya kawaida. Mara nyingi ritriti inaendana na kimya na saumu, ndiyo sababu inaitwa pia "mafungo". Vipindi vya namna hiyo vinahimizwa katika dini mbalimbali, kama vile Uhindu, Ubuddha, Ukristo na Uislamu. Cooper, David A. (1999). Silence, Simplicity & Solitude: A Complete Guide to Spiritual Retreat. SkyLight Paths Publishing. ISBN 978-1-893361-04-1.  Merianne Liteman, Sheila Campbell, Jeffrey Liteman, Retreats that Work: Everything You Need to Know About Planning and Leading Great Offsites, Expanded Edition, ISBN 0-7879-8275-X Stafford Whiteaker, The Good Retreat Guide, ISBN 1-84413-228-5 Zangpo, Ngawang (1994). Jamgon Kongtrul's Retreat Manual. Snow Lion Publications. ISBN 978-1-55939-029-3.  Ignatian Spirituality - Prayer, Spiritual Direction, Retreats, and Good Decisions