Sweeny is a surname. It may also refer to:

• Sweeny Inlet, Antarctica
• Sweeny, Texas, United States, a city
  • Sweeny High School (Texas)
• Clarence Williams (defensive end) (1946–2017), American football player nicknamed "Sweeny"
• The title character of Sweeny Toddler, a British comic strip published between 1973 and 2000
• Operation Sweeny, a 15 October 2003 anti-smuggling operation during the Iraq War