Tomasz Bogumil Lenczewski (born 28 December 1960 in Lodz), is a Polish heraldist, genealogist, canonist and second-hand bookseller.
He is the continuator of the genealogies of the titled houses of Poland (following in the steps of Count Jerzy Seweryn Dunin-Borkowski and Edward Borowski) and the author of several score articles in the field of contemporary Polish history and studies related to history (chiefly in genealogy and biography) some which have been published in the following periodicals:
Zeszyty Historyczne (The Historical Journal),
Karta (The Historical page),
Mars,
Genealogisches Handbuch des Adels und Rzeczpospolita.(in German)