Professor Ambroży Kleks (English: Ambrose Inkblot), commonly referred to as Pan Kleks (English: Mr. Inkblot or Mr. Blot), is a fictional character in the Pan Kleks series, a trilogy^[1] of books written by Polish author Jan Brzechwa. He is depicted as the founder and headmaster of a magical academy for wizards that is attended by boys whose names begin with the letter "A".^[2] Kleks is depicted as a tall and eccentric man with a bushy beard, who wears a velvet frock coat over a waistcoat with numerous pockets.^[2] Among his magical abilities is his ability to change his size.^[2]

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The character was partly based on Franciszek Fiszer, a Polish metaphysician and alchemist known to the literary circles of pre-World War II Warsaw.^[2]

Kleks was portrayed by Piotr Fronczewski in three films based on the book series, each of which were directed by Krzysztof Gradowski [pl]: Akademia pana Kleksa (1983), Podróże pana Kleksa (1986) and Pan Kleks w kosmosie (1988). Fronczewski also voiced the character in the 2001 animated film Tryumf pana Kleksa.

• Akademia pana Kleksa (Academy of Mr. Kleks, 1946)
• Podróże pana Kleksa (Travels of Mr. Kleks, 1961)
• Tryumf pana Kleksa (Triumph of Mr. Kleks, 1965)

• Akademia pana Kleksa (Academy of Mr. Kleks, 1983)
• Podróże pana Kleksa (Travels of Mr. Kleks, 1986)
• Pan Kleks w kosmosie (Mr. Kleks in Space, 1988)
• Tryumf pana Kleksa (Triumph of Mr. Kleks, 2001, animated)

• Przygody pana Kleksa (musical) [pl], 1974
• Niezwykłe przygody pana Kleksa (television play) [pl], 1980
• Akademia pana Kleksa (musical) [pl], 2007