1/3 or may refer to:
Dates January 3 (month–day notation) 1 March (day–month notation) January of the year 3 AD (month–year notation) March of the year 1 AD (year–month notation)
Other uses , a fraction (one third, 0. or 0.33333... in decimal, Unicode ⅓) Pre-decimal British sterling currency of 1 shilling and 3 pence 1st Battalion, 3rd Marines, US infantry battalion One/Three, a 2001 studio album by Dabrye Loona 1/3, a Loona spin-off
See also Third (disambiguation)