Most non-denominational evangelical churches practice two ordinances: water baptism and the Lord's Supper (Communion). These are generally understood as symbolic acts of obedience and testimony rather than as sacraments that convey saving grace. The term 'ordinance' is commonly preferred over 'sacrament' to emphasize the commemorative and obedient nature of these practices.

On baptism, non-denominational evangelical churches vary between believer's baptism by immersion (the most common approach) and churches that permit or practice infant baptism or sprinkling. The majority of non-denominational evangelical churches baptize only professing believers and typically use full immersion, though practices vary. Some non-denominational churches that emerged from Presbyterian or Anglican backgrounds may retain infant baptism.

On the Lord's Supper, virtually all non-denominational evangelical churches hold a memorialist or 'low church' view: the bread and juice (rarely wine) are symbols of Christ's body and blood, commemorating his death until he returns. Transubstantiation and Lutheran consubstantiation are rejected. The frequency of Communion ranges from weekly (in some elder-led or liturgically influenced churches) to monthly or quarterly.