OIP

OIP may refer to:


 * Ohio Institute of Photography, US
 * Ovamboland Independence Party, later National Democratic Party, Namibia
 * Oil-for-Food Programme, a former UN programme in Iraq
 * Former Office of the Iraqi Programme
 * × Oncidopsis (Oip.), an orchid nothogenus corresponding to Miltoniopsis × Oncidium; see × Burrageara