PA21 may refer to:

• Pennsylvania Route 21
• Pennsylvania's 21st congressional district
• Piper PA-21, an aircraft prototype
• Pitcairn PA-21, an autogyro of the 1930s

• Qorxmazoba
• Qorx-mazoba
• Qoryale
• Qoryoley
• Qory Sandioriva
• Qorçi
• Qorçu
• Qorçulu
• Qorğan
• QoS
• Qosabeh
• Qosabulaq
• Qosabulaq, Gadabay
• Qosabulaq, Jabrayil
• Qosadiza
• Qosa Diza
• Qosadiza, Babek
• Qosadiza, Ordubad
• Qosa Dize
• Qosadize
• Qosadize, Babek
• Qosadize, Ordubad
• Qosakand
• Qosakend
• Qosalar