1/7

1/7 or 1-7 most commonly refers to 1/7 (number), a fraction (one seventh, $1/7$)

1/7 may also refer to:
 * January 7 (month-day date notation)
 * 1 July (day-month date notation)
 * 1st Battalion 7th Marines, an infantry battalion of the 7th Marine Regiment of the United States Marine Corps.
 * 7th Battalion (1st British Columbia), CEF
 * The margin at Brazil v Germany (2014 FIFA World Cup)
 * 1 shilling and 7 pence in UK predecimal currency
 * Schweizer SGU 1-7