Alfons Flisykowski (22 September 1902 – 5 October 1939) was a Polish worker of the Polish Post Office in the Free City of Danzig in the years 1923–1939 and a second commander (after Konrad Guderski) of the defence of the Post Office from the invading Nazi German forces when World War II started on 1 September 1939.

Denied the legitimate status of POW, he was put on trial (which was later found to be illegal), together with the other 37 captured post-office workers.

Designated as a "bandit" by a paramilitary court (and therefore not protected by the Geneva Convention), he was sentenced to death and executed by firing squad in Danzig-Saspe on 5 October 1939.

With the help of Dieter Schenk, a former worker of Interpol and the author of a book on the subject, the case was put into a verification trial.

As a result of these actions the Land Court in Lübeck made a decision, on 30 December 1996, that the previous verdict of 1939 sentencing Flisykowski to death was illegal.