3/5

3/5 or $3/5$ may refer to:


 * The fraction, 3/5
 * 3/5 (album), a 1997 album by Les Savy Fav
 * March 5, month-day date notation
 * 3 May, day-month date notation
 * 3rd Battalion 5th Marines, an infantry battalion in the United States Marine Corps
 * Three-fifths Compromise, American legislation for determining the proportional value of slaves in pre-Civil War census counts
 * Three-fifths majority, a supermajority used in some political votes