Biffy may refer to:

• Biffy Clyro, a Scottish alternative rock band
• A term for an outhouse (Bathroom In Forest For You)
• The nickname of:
  • Amyas Borton (1886–1969), British pilot and air commander
  • Wilfred Dunderdale (1899–1990), British spy and intelligence officer

• March 14 block
• March 14 coalition
• March 14 (Eastern Orthodox liturgics)
• March 14 group
• March 15 (Eastern Orthodox liturgics)
• March 1605 papal conclave
• March 1679 English general election
• March 16 (Eastern Orthodox liturgics)
• March 17 (Eastern Orthodox liturgics)
• March 18-23, 2012 tornado outbreak
• March 18-23, 2012 tornado outbreak sequence
• March 1870 Portuguese legislative election
• March 1874 Galway Borough by-election
• March 1875 Southeast tornado outbreak
• March 1875 Tipperary by-election
• March 1890 Mid–Mississippi Valley tornado outbreak
• March 1893 Serbian parliamentary election
• March 18 (Eastern Orthodox liturgics)
• March 18–23, 2012 tornado outbreak sequence
• March 1902 Stanley Cup championship
• March 1907
• March 1909 Los Angeles mayoral election
• March 1910 Stanley Cup championship
• March 1912
• March 1913