Charles Cathcart may refer to:

• Charles Cathcart, 8th Lord Cathcart (1686–1740), British Army officer
• Charles Cathcart, 9th Lord Cathcart (1721–1776), British soldier and diplomat
• Charles Cathcart, 2nd Earl Cathcart (1783–1859), British Army general and Governor General of the Province of Canada
• Charles Cathcart, 7th Earl Cathcart (born 1952), British peer and member of the House of Lords
• Charles Allan Cathcart (1759-1788), British soldier and MP, son of the 9th Lord Cathcart
• Charles W. Cathcart (1809–1888), United States Representative and Senator from Indiana
• Charles Cathcart (rugby union) (1853-1932), Scottish rugby union player

• Molybdenum deficiency (plant disorder)
• Molybdenum dichloride dioxide
• Molybdenum fluoride
• Molybdenum hexachloride
• Molybdenum(III) hexacarbonyl
• Molybdenum(IV) oxide
• Molybdenum mining in the United States
• Molybdenum oxytetrachloride
• Molybdenum(VI) chloride
• Molybdocene dihydride
• Molybdovanadate reagent
• Molycreia
• Molycreium
• Molycria
• Molycria (Greece)
• Molyda Szymusiak
• Moly (fastener)
• MolyJam
• Molyjam
• Molykreia
• Molykreio
• Molykreion
• Molykria
• Molykrio
• Molyn