OPI may refer to:

• Order of Perpetual Indulgence or Sisters of Perpetual Indulgence
• The Office of Police Integrity, Victoria, Australia

• Open Payment Initiative
• Ocular protection index

• Opi, Abruzzo, a comune in Italy
• Opi (archaeological site), Enugu State, Nigeria

• Over the phone interpreting
• Oral Proficiency Interview
• OPI Products, a US nail polish manufacturer
• Opi, an Igbo musical instrument
• Oremus Pro Invicem, Latin for Let us Pray for each other (see List of Latin phrases (O))

This disambiguation page lists articles associated with the title OPI.
If an internal link led you here, you may wish to change the link to point directly to the intended article.