Mieczyslaw Zdzienicki, Siekiel-Zdzienicki (February 15, 1892 in Mszczonów – October 16,1953 in Starzyny) was a Polish social activist, lawyer, bibliophile, President of “Friends Book Society” in Kalisz.
He was one of leading personalities in local "Towarzystwa Przyjaciól Ksiazki" (Friends Book Society) in Kalisz.
Zdzienicki, which developed a logo of a “Friends Book Society” in Kalisz.
Zdzienicki was a President – from the day of initiation in October 1927 to 1936, when the activities of the society slowed down after deaths of several active members (Felicji Laczkowskiej, Alfonsa Parczewskiego, Mieczyslawa Krauckiego).
In 1928 Mieczyslaw Zdzienicki became a member of the Supreme Bibliophile Council established three years earlier in Krakow.
In professional life Zdzienicki was a prominent lawyer in Warsaw than in Kalisz.
He was on the Board of Directors of the society public library “Adam Mickiewicz” in Kalisz.
In June 1939 he was elected to City Council as the candidate of the National-Catholic party.
Mieczyslaw Zdzienicki developed Registry of noble families in Grójec County (Kalisz, 1937).
After the outbreak of World War II he carried out genealogical research and worked on a book relating to St.
Wojciech (which he did not complete).
The tomb of Mieczyslaw Zdzienicki and his wife Jadwiga (Karpinska) is located at the cemetery in Wartkowice near Leczyce.