Baltimore Dharma Group Zen Buddhist Practice Center - Small Soto Zen practice group with weekly sittings, study group, and one-day retreats. Not affiliated with any one teacher. - http://web.mac.com/bdgzendo/
Rockville: Dae Do Sah - Member of the Kwan Um School of Zen. Offers weekly meditation practice. - http://www.zenmind.org/rockville.html
Baltimore: Burning House Zen Community - Rinzai Zen Buddhist Zazenkai offering several sittings each week and periodic special events. - http://burninghousezendo.org/
Sparks: Zen Community of Baltimore - Clare Sangha - Offers weekly zazen practice and frequent retreats in the Baltimore area. Affiliated with the White Plum Sangha, Harada Yasutani lineage. - http://www.zcbclaresangha.org/
Stillwater Mindfulness Practice Center - Offers mindfulness Practice in the Tradition of Thich Nhat Hanh. Provides several sittings each week, and periodic workshops. - http://www.stillwatermpc.org/