No. 1 Squadron is an air force squadron in several countries:

United Kingdom

• No. 1 Squadron Royal Air Force, also was No. 1 Squadron Royal Flying Corps
• No. 1 Squadron RAF Regiment
• No. 1 Squadron Royal Naval Air Service, now No. 201 Squadron RAF

Australia

• No. 1 Squadron Royal Australian Air Force
• No. 1 Airfield Operations Support Squadron Royal Australian Air Force
• No. 1 Airfield Defence Squadron Royal Australian Air Force

Other countries

• No. 1 Squadron Royal New Zealand Air Force
• No. 1 Squadron Indian Air Force
• No. 1 Squadron South African Air Force
• No.1 Squadron Belgian Air Force

United States Air Force

• 1st Air and Space Test Squadron
• 1st Airborne Command and Control Squadron
• 1st Airlift Squadron
• 1st Combat Communications Squadron
• 1st Fighter Squadron
• 1st Helicopter Squadron
• 1st Reconnaissance Squadron
• 1st Space Control Squadron
• 1st Space Development Squadron
• 1st Space Launch Squadron
• 1st Space Operations Squadron
• 1st Special Operations Squadron

United States Navy:

• VBF-1
• VF-1