Signor Bonaventura is an Italian comic strip created in 1917 by actor and playwright Sergio Tofano.

It was a full-page comic strip composed of eight vignettes, each accompanied by a text in verse.

"Signor" simply refers to the male gender of the character, thus literally meaning "mister".

Signor Bonaventura was protagonist of several plays written and performed by Sergio Tofano between 1927 and 1953.

In 1941 the same Tofano directed a film adaptation of the comic strips, Princess Cinderella (Cenerentola e il signor Bonaventura), in which the main character was played by Paolo Stoppa.