Herman Kruk (Yiddish: הערשל קרוק) (19 May 1897-18 September 1944) was a Polish-Jewish librarian and Bundist activist who kept a diary recording his experiences in the Vilna Ghetto during World War II.

[5] Kruk continued chronicling his experiences after he was transferred to the Klooga concentration camp.

[3] The last entry was made on September 17, 1944, when he buried his diaries inside the camp at KZ Lagedi in Estonia.

The following day, he and almost all the other prisoners were forced to carry logs to a pile, spread them in a layer, lie down naked on them so they could be executed and burned in a massive pyre.

An expanded English translation, The Last Days of the Jerusalem of Lithuania: Chronicles from the Vilna Ghetto and the Camps 1939-1944, was published in 2002 (ISBN 0300044941).