| Abbreviation | Definition |
|---|---|
| ATC | All The Children |
| ATC | Almost Total Conversion |
| ATC | Aquarian Tabernacle Church |
| ATFM | A Triumph For Man |
| ATID | Afterschool Torah Im Derekh |
| ATM | Awana Teen Ministries |
| ATP | All Things Possible |
| ATR | African Traditional Religion |
| ATTGOG | All To The Glory Of God |
| ATW | All Things Written |
| ATWC | Anglican Trust for Women and Children |
| AUB | Apostolic United Brethren |
| AUBS | American University of Biblical Studies |
| AUMC | Auburn United Methodist Church |
| AV | Angel Voice |
| AVBC | Apple Valley Baptist Church |
| AVCC | Antelope Valley Christian Center |
| AVCC | Association of Vineyard Churches Canada |
| AVCS | Aliso Viejo Christian School |
| AVCS | Almaden Valley Christian School |