The Imperial Porcelain Factory (Russian: Императорский Фарфоровый Завод, romanized: Imperatorskii Farforovyi Zavod), also known as the Imperial Porcelain Manufactory (abbreviated as IPM), is a producer of hand-painted ceramics in Saint Petersburg, Russia. It was established by Dmitry Ivanovich Vinogradov in 1744 and was supported by the Russian tsars since Empress Elizabeth.

Cobalt net, the trademark style of the Imperial Porcelain Factory.

It is the best-known pattern, first appeared in 1949. The design is based on a blue net pattern that was painted on raised lines cast into the porcelain dinnerware pieces of Catherine the Great. The factory has actual examples of Catherine's dinnerware with this design. The new design pattern is a combination of intersecting lines of cobalt blue with inverted tear drops of cobalt blue (made from mineral cobalt) and 22 karat gold accents.[4] There is also a version that artist Anna Yatskevich, the author of the famous cobalt net, painted a set in memory of the cross-glued windows of houses and the cross-light of searchlights that illuminated the sky of besieged Leningrad. These crosses on the windows were used as a device reducing small vibrations because of strong blast wave.