John Baptist Albertrandi (in Poland known as Jan Chrzciciel, 7 December 1731 – 10 August 1808) was a Polish Jesuit, bishop and historian of Italian extraction, born in Warsaw.

With his own hand he copied manuscripts referring to Poland and Lithuania wherever he found them and in three years amassed a collection of one hundred and ten folio volumes.

He also collaborated with Adam Naruszewicz in a periodical called "Agreeable and Useful Recreations", and produced a work on numismatics, besides many discourses for the Academy of Warsaw, which he founded.

After the dissolution of the Society of Jesus, he became Royal Librarian, was appointed Bishop to the titular see of Zenopolis, and was decorated with the order of St. Stanislaus.

In his work in the Royal library, he not only published a catalogue in ten volumes octavo, but left critical remarks in each of the books.