Constitutional convention may refer to:

• Constitutional convention (political custom), an informal and uncodified procedural agreement
• Constitutional convention (political meeting), a meeting of delegates to adopt a new constitution or revise an existing constitution

• Constitutional Convention (Australia), any of four gatherings in 1891, 1897–98, 1973, and 1998
  • Australian Constitutional Convention 1998
• Constitutional Convention (Ireland), established in 2012
• Constitutional Convention (Philippines)
• Scottish Constitutional Convention
• Constitutional conventions of the United Kingdom
• Icelandic constitutional convention, 2010-2013

• Constitutional Convention (United States), wrote the current U. S. Constitution in 1787
• Convention to propose amendments to the United States Constitution, one of two processes for proposing amendments
• Second Constitutional Convention of the United States, a proposal to reform and rewrite the Constitution
• California Constitutional Conventions

• Constituent Assembly (disambiguation)
• Constitutional Commission