Duke Ai may refer to:

• Duke Ai of Qi ({{floruit}} 9th century BC), ruler of Qi during Western Zhou
• Duke Ai of Qin (died 501 BC), ruler of Qin during the Spring and Autumn period

• Stop Cyber Spying Week
• Stop de Kindermoord
• Stop digging
• Stop (dog)
• Stop-down metering
• Stop Dragging Me Down
• Stop Draggin' My Heart Around b/w A Wake for the Minotaur
• Stope, Slovenia
• Stopethyl
• Stopette
• Stopety
• Stopetyl
• Stope, Velike Lasce
• Stop Exploitation Through Trafficking Act of 2013
• Stopford Brooke (disambiguation)
• Stopford, John M.
• Stop Forwarding That Crap to Me
• Stop Frame Productions
• Stop & frisk
• Stop gate
• Stop Genocide
• Stop Girl
• Stop Girl (UKISS EP)
• Stop & Go
• StopHam (organization)