OPI

OPI may refer to:

Organizations

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

Science and technology

 * Open Payment Initiative
 * Ocular protection index

Places

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

Other uses

 * 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))