The Oregon State University (OSU) and its extension service devote a significant amount of effort to potato research, in areas such as variety development, Crop Management, Weed Control, Disease Control and Insect Control.

OF&G was formed in 1973 as a marketing cooperative for organic produce but are now a dedicated organic control body and certifier for a number of other sustainable land use schemes.

Since it's inception in 2002, Oro Agri has developed, manufactured and marketed a range of agrochemical products for global distribution. They deal in crop protection and yield enhancing solutions.

Özbil Tarım Makineleri was founded by Bekir Özdemir in Ödemiş, İzmir, in 1978. In their factory, they manufacture various machinery which is utilized in agricultural activity such as soil preparation, plantation, weeding, fertilization and others.

The P.E.I. Potato Quality Institute is owned by the potato producers of Prince Edward Island. This not-for-profit organization functions under the guidance of a Board of Directors, consisting primarily of potato producers.

P J Lee and Sons - Highflyer Farms, are one of the largest individual potato producers in the UK, serving chip shops predominately.

Pace International, LLC id the manufacturer of BIOX, a line of Natural Sprout Inhibitors

Packo Agri focuses on the sale and marketing of agricultural machines: machines for haymaking, tillage and sowing technology, fertilizer spreaders, sprayers and machines for feeding technology of the brands Kuhn, Köckerling, Agricola Italiana and Kerner.

Palacios Escutia S.L. is a Spanish company dedicated to the production, exportation, and importation of fruits and vegetables since 1983.

Palmgren farm is located in Colorado, United States. They are growing seed potatoes and some range of organic potatoes.

Located along the shores of the Pamlico Sound in Eastern North Carolina, Pamlico Shores grows, packs and ships quality produce. They produce potatoes on the farm.

Pan European Potato Enterprise, Ltd (Pep Ltd) is a company involved in the growing and marketing of seed and table potatoes for export (from the UK)

Papas Arcoiris is a family business, founded in 2002 by Boris Contreras Kusch together with his father Andrés Contreras (1943-2014). It is located in Puerto Varas, Los Lagos Region and is dedicated to the production of potatoes, of different colors and shapes, to market them both in Chile and in the most demanding markets in the world.

Pappins is the brand of Lazaro, under which they offer potatoes like Fry Potato, Red Potato, Mini Potato, Versatile Potato etc.

Parilla Premium Potatoes was established in 1990 by Allan Pye with his son, Mark Pye and daughter in-law, Fiona Pye. The Pye family moved to the Mallee Region from New Zealand after being approached by McCain's to grow potatoes for their Australian operation.

Parkinson Foundation Seed Farm was created out of a demand for clean potato seed.

Parkland Seed Potatoes Ltd. is a potato variety marketing company introducing new Agrico potato varieties to Canada, the United States, and Mexico.

Parmentine brings together more than 400 producers who grow potatoes on 3,835 hectares of land. This enterprise has 240 shareholders, employs more than 200 people, typically packs 1,150 tons of potatoes per day, and has storage facilities for 150,000 tons.