This article describes the Christian Inventory of Spirituality (CIS), developed to measure changes in feeling, thinking, and behaviors toward self, others, and God accompanying spiritual transformation of persons completing Christian spiritually based alcohol/other drugs (AOD) recovery programs. The initial item pool was generated in focus groups with program participants. Exploratory factor analysis identified 48 items in five spiritual dimensions. The instrument's reliability was evaluated with data from 954 respondents from 31 programs in Texas and California. Stability, construct validity, and preliminary normative data testing were examined. Analysis revealed a useful, reliable, valid, and stable measure of spiritual change.