- ACNI stands for Arts Council of Northern Ireland
- ACNI stands for American Community Newspapers, Inc. (Addison, TX; also seen as ACN)
- ACNI stands for America Chung Nam, Inc. (paper recycling; Los Angeles, CA)
- ACNI stands for Age Concern Northern Ireland (UK)
- ACNI stands for Anugerah Carta Nasyid IKIM (Institut Kefahaman Islam Malaysia; Malaysian radio station)
- ACNI stands for Azienda Comunale per la Navigazione Interna (Municipal Company for Inland Navigation, Italy)
ACNI