1/8 or 1⁄8 may refer to:

• January 8 (month-day date notation)
• 1 August (day-month date notation)
• the Fraction one eighth, 0.125 in decimal, and 12.5% in percentage
• 1st Battalion, 8th Marines

• 8th
• Eighth (disambiguation)
• 8 (disambiguation)
• Okta