Class 3

• Appliance classes
• BR Standard Class 3 2-6-0
• BR Standard Class 3 2-6-2T
• Class 03 (disambiguation)
• Class III (disambiguation)
• Classes of United States senators
• NSB Di 3
• NSB El 3
• National Insurance
• SCORE Class 3
• Type 3 (disambiguation)
• Yosemite Decimal System