Project Harmony may refer to:

• Project Harmony (organization), an international organization which aims to build a strong global community
• Project Harmony (FOSS group), an initiative concerning Open Source software
• Apache Harmony was an Apache Software foundation project to create a FOSS Java implementation

• Arpara Ideal High School
• Arpara ideal high school
• Arpasel River
• Arp Aslan
• Arpas River
• Arpasto
• Arpasu de Jos
• Arpasul Mare River
• Arpa-Tektir
• Arpatlar
• Arpa Valley
• Arpavar
• Arpavon
• ARP Axxe
• Arpaz
• Arpa Çayı
• Arpaçay, Azerbaijan
• Arpaçay Dam
• Arpașu de Jos
• ARPA – Aerolineas Paraguayas
• ARPC1A
• ARPC1B
• ARPC2
• ARPC3
• ARPC4