OPI

OPI may refer to:

• OPI Nail Polish, a nail beauty product brand
• Oremus Pro Invicem from the Latin, Let us Pray for each other (see List of Latin phrases (O))
• Open Payment Initiative
• Over the phone interpreting
• Oral Proficiency Interview
• OPI (organisation) Order of Perpetual Indulgence (see Sisters of Perpetual Indulgence)
• Opi, Abruzzo, a comune in Italy
• C. opilio, a species of Chionoecetes crab
• Opi (instrument), an Igbo musical instrument
• The Office of Police Integrity, an independent agency formed by the Victorian Government investigating police corruption
• Online Provisioning Interface (Telecommunications: Intelligent Network element)