DirkJan is a comic, the creation of Dutch author and artist Mark Retera. It is also the name of its main character.

DirkJan is a loser who stumbles through life in mostly three-panel comic strips. He started out in 1989 as a student at the current Radboud University Nijmegen in the Netherlands, where he lived in a typical student house with all the stereotypical side-kicks, such as the fat boy, the beer drinker, the bossy girl who checks if everybody keeps to the house rules, and the tramps who use the heated shared hallway to stay the night. Early DirkJans contained many references to the student life of Nijmegen.

DirkJan was first published in Critic, the magazine for the local union of psychology students. It then moved on to monthly publication in the student magazine of Nijmegen (Algemeen Nijmeegs Studentenblad, ANS). DirkJan became known nationally when the then only commercial comics magazine of the Netherlands SjoSji (now defunct) started publishing the strip.

With the last move, the nature of the strip changed. Most of the student side-kicks got cancelled and DirkJan left university, first for jail (DJ is a notorious Kabouter abuser) and then to wander the globe and indeed space.

As of November 2007, there are thirteen DirkJan albums, tentatively named 'DirkJan 1' through 'DirkJan 13'. Several newspapers in the Netherlands publish the comic in their daily edition.

The amateur comics magazine Iris (1990 - 1995) (re)published a number of DirkJan comics, some of which were refused for publication in SjoSji.