1/9

1/9 may refer to: 1/9 (number), a fraction (one ninth, ) 1st Battalion, 9th Marines, an infantry battalion of the United States Marine Corps January 9 or September 1, depending on date format Breaker 1/9, a song by Common Former 1 (New York City Subway service) and 9 (New York City Subway service), which shared the same route U.S. Route 1/9, in New Jersey

==See also== 9/1 (disambiguation) 1-9 (disambiguation)