| Abbreviation | Definition |
|---|---|
| ACE | After the Common Era |
| ACE | Alliance for Catholic Education |
| ACE | Aviation, Communications, and Evangelism |
| ACEA | Alabama Christian Education Association |
| ACEM | Association Of Christian Evangelical Ministries |
| ACF | Alliance Christian Fellowship |
| ACF | Austin Christian Fellowship |
| ACFI | Austin Christian Fellowship of India |
| ACFO | Alexander Christian Foundation of Oregon |
| ACFP | Adore Christ For Peace |
| ACFS | Assumption College For Sisters |
| ACGR | Association of Christian Graduate Researchers |
| ACHF | Association of Christian Homeschool Families |
| ACHS | Arlington Catholic High School |
| ACIC | Anglican Communion In Canada |
| ACIFK | Apostolic Church International Fellowship of Kenya |
| ACIL | Ateneo Catechetical Instruction League |
| ACIM | A Course In Miracles |
| ACIP | Anglican Council of Indigenous People |
| ACIT | Alhambra Catholic Invitational Tournament |