There is a growing body of literature documenting the positive effects of both religiousness and spirituality on human health, particularly among those who are ageing or diagnosed with a life-limiting illness. These positive effects provide buffers to life's stressors such as those associated with mental illness, care-giver burden, substance abuse and social disruption resulting from war. An important aspect of health care for individuals of all ages involves completion of a spiritual assessment. This paper explores the concept of spirituality and spiritual assessment, which has many definitions in the literature, and also provides examples of assessment tools from theology, nursing, social work and medicine.