3/8

3/8 or $3/8$ may refer to:


 * 3rd Battalion, 8th Marines
 * the calendar date March 8 (United States)
 * the calendar date August 3 (Gregorian calendar)
 * the fraction, three eighths or 0.375 in decimal
 * a time signature
 * 3/8 (album), a 2007 album by Kay Tse