AC8 or AC-8 may refer to:

• USS Neptune (AC-8), a US Navy collier ship active during World War I
• Comte AC-8, a 1930s Swiss six-seat light transport aircraft
• Southern Pacific class AC-8, a model of steam locomotive
• AC-8, an IEC Utilization Category
• Assassin's Creed Odyssey, an action-adventure video game, the eighth main game in the Assassin's Creed series

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