ACAC may stand for:
- In electricity, AC is the abbrevation of alternating current.
- AC is an automobile brand, see AC Cars
- AC can refer to an Anonymous Coward on Slashdot.
- AC can also means ante christum, that is to say before Christ
- AC refers to a chemotherapy regime comprising adriamycin and cyclophosphamide
- Ac is the chemical symbol for actinium