Catherine Dolgorukov, mistress and morganatic 2nd wife of Emperor Alexander II, with Emperor Alexander and two of their children; Credit – Wikipedia
- Lover: a person who has a sexual or romantic relationship with another
- Mistress: a woman who has a continuing, extramarital sexual relationship with one man
This does not purport to be a complete list.
- Count Alexei Grigorievich Razumovsky, lover of Empress Elizabeth
- Elizaveta Romanovna Vorontsova, mistress of Emperor Peter III
- Count Sergei Vasilievich Saltykov, lover of Empress Catherine II
- Count Grigory Grigoryevich Orlov, lover of Empress Catherine II
- Prince Grigory Alexandrovich Potemkin, lover of Empress Catherine II
- Prince Platon Alexandrovich Zubov, lover of Empress Catherine II
- Anna Petrovna Lopukhina, mistress of Emperor Paul I
- Maria Antonovna Naryshkina, mistress of Emperor Alexander I
- Catherine Dolgorukov, Princess Yurievskaya, mistress and morganatic 2nd wife of Emperor Alexander II
- Mathilde Feliksovna Kschessinska, mistress of Emperor Nicholas II before marriage, mistress of Grand Duke Sergei Mikhailovich, and mistress and wife of Grand Duke Andrei Vladimirovich
- Olga Valerianovna Karnovich, Princess Paley, mistress and morganatic 2nd wife of Grand Duke Paul Alexandrovich
- Natalia Sergeyevna Sheremetyevskaya, Countess Brasova, mistress and morganatic wife of Grand Duke Michael Alexandrovich