100s BC

200s BC 100s BC 99–1 BC
Decades of the 100s BC:
190s BC 180s BC 170s BC 160s BC 150s BC 140s BC 130s BC 120s BC 110s BC 109–100 BC

100s BC may refer to:

• The period from 199 BC to 100 BC, almost synonymous with the 2nd century BC
• 109–100 BC, rarely