OKB Gidropress
| Company type | Joint-stock company | 
|---|---|
| Founded | 1946 | 
| Headquarters | , Russia | 
| Products | Nuclear reactors | 
| Parent | Rosatom | 
| Website | www | 
OKB Gidropress (Russian: ОКБ Гидропресс) is a Russian state construction office which works on the design, analysis, development, and production of nuclear power plant reactors, most notably the VVER range. OKB stands for experimental design bureau (опытно-конструкторское бюро, opytno-konstruktorskoe bjuro).