100s

100s may refer to:


 * The period from 100 to 199 AD, almost synonymous with the 2nd century (101–200)
 * The period from 100 to 109 AD, known as the 100s (decade) almost synonymous with the 11th decade (101–110)
 * The period from 199 to 100 BC, synonymous with the 2nd century BC
 * The period from 109 to 100 BC, known as the 100s BC (decade)
 * 100mm cigarettes, a tobacco product
 * 100s (rapper) or Kossisko, American rapper
 * One-hundred-base-unit banknotes