The Department for Protecting the Public Security and Order (Russian: Отдѣленіе по Охраненію Общественной Безопасности и Порядка), usually called "guard department" (okhrannoye otdelenie) and commonly abbreviated in modern sources as Okhrana or Okhranka in Russia, was a secret police force of the Russian Empire and part of the police department of the Ministry of Internal Affairs (MVD) in the late 19th century, aided by the Special Corps of Gendarmes.
Formed to combat political terrorism and left-wing revolutionary activity, the Okhrana operated offices throughout the Russian Empire and satellite agencies in a number of foreign nations. It was concerned primarily with monitoring the activities of Russian revolutionaries abroad, most notably in Paris, where Pyotr Rachkovsky was based (1884–1902).
The task was performed by multiple methods, including covert operations, undercover agents, and "perlustration" — reading of private correspondence. Even the Foreign Agency served this purpose. The Okhrana was notorious for its agents provocateurs, including Dr. Jacob Zhitomirsky (a leading Bolshevik and close associate of Vladimir Lenin), Yevno Azef, Roman Malinovsky and Dmitry Bogrov.