Augustina Stridsberg, formerly Augustina Jirku (born in Vienna, c. 1896), was an American citizen, and the mother of Margietta Voge (née Jirku). Both mother and daughter worked for Soviet intelligence between 1943 and 1944. Stridsberg worked for the KGB San Francisco office. Her code name with Soviet intelligence, as deciphered by the Venona project, was "Klara".
Stridsberg was also a writer and an interpreter as well as a literary translator.
Stridsberg is referenced in the following Venona decryptions:
- 500 KGB San Francisco to Moscow, 27 November 1943;
- 26 KGB San Francisco to Moscow, 17 January 1944;
- 39 KGB San Francisco to Moscow, 22 January 1944;
- 104 KGB San Francisco to Moscow, 5 March 1944;
- 725 KGB New York to Moscow, 1944 May 19.