AC1 may refer to:
*
AC1, a ranking grading within the
Royal Air Force
The Royal Air Force (RAF) is the Air force, air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the World War I, First World War on 1 April 1918, on the merger of t ...
between 1919 and 1964
*
AC1, a candidate phylum of bacteria
*
AC1, a complexity class in circuit complexity
*
AC1 Sentinel, an Australian cruiser tank
* AC-1, an IEC
Utilization Category
*
Action Comics #1, containing the first appearances of several superheroes
*
Atlantic Crossing 1
Atlantic Crossing 1 (AC-1) is an optical submarine telecommunications cable system linking the United States and three European countries.
It transports speech and data traffic between the U.S., the U.K., the Netherlands and Germany. It is one ...
, an optical submarine telecommunications cable system
*
''Assassin's Creed'', the first game in the Assassin's Creed series
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