Chelonii may refer to:

• Chelonii, the order of turtles.
• Chelonioidea, the superfamily of sea turtles, who have a synonym of Chelonii.
• Cheloniidae, a family of sea turtle, who have a synonym of Chelonii.

• Bowline on the bight
• Bowline with a Yosemite finish
• Bowline with Yosemite finish
• Bowling
• Bowling and barkerend
• Bowling and Cue Sports Federation of the Islamic Republic of Iran
• Bowling at the 1985 Southeast Asian Games
• Bowling at the 1988 Summer Olympics
• Bowling at the 1991 Pan American Games
• Bowling at the 1995 Pan American Games
• Bowling at the 1999 Pan American Games
• Bowling at the 2002 Asian Games
• Bowling at the 2003 Pan American Games
• Bowling at the 2005 South East Asian Games
• Bowling at the 2007 Asian Indoor Games
• Bowling at the 2007 Southeast Asian Games
• Bowling at the 2007 South East Asian Games
• Bowling at the 2009 Asian Indoor Games
• Bowling at the 2009 Asian Youth Games
• Bowling at the 2010 Asian Games
• Bowling at the 2010 Central American and Caribbean Games
• Bowling at the 2010 South American Games
• Bowling at the 2010 South American Games - Men's all events singles
• Bowling at the 2010 South American Games - Men's all events teams
• Bowling at the 2010 South American Games - Men's doubles