| Abbreviation | Definition |
|---|---|
| ACJC | Apostolic Church of Jesus Christ |
| ACMC | Advancing Churches in Missions Commitment |
| ACMC | American Church Mortgage Co |
| ACMC | American Church Mortgage Company |
| ACMS | Adventist Church Management System |
| ACN | Aid to the Church in Need |
| ACNA | Anglican Church in North America |
| ACNA | Anglican Church of North America |
| ACOC | Athens Church of Christ |
| ACOE | Assyrian Church Of the East |
| ACOG | Apostolic Church Of God |
| ACOP | Apostolic Church Of Pentecost |
| ACPC | Aliso Creek Presbyterian Church |
| ACPC | Auckland Chinese Presbyterian Church |
| ACPI | Anglican Church Planting Initiatives |
| ACPN | Arkansas Church Planting Network |
| ACS | Church Software |
| ACSA | Anglican Church of Southern Africa |
| ACTC | Assistance Center of Towson Churches |
| ACTS | All Church Together Serving |