Mirosław Wojciech Trzeciak (born 11 April 1968), nicknamed Franek, is a Polish former professional footballer who played as a striker.

During his career, Trzeciak, a Gwardia Koszalin trainee, also represented Lech Poznań – two different spells – BSC Young Boys (Switzerland), Maccabi Tel Aviv FC (Israel, for a few months), ŁKS Łódź, CA Osasuna and Polideportivo Ejido (both in Spain).

In the latter country his La Liga totals consisted of ten matches during the 2000–01 season, spent with the former side.

For eight years he was also a Poland international (22 caps, eight goals), but his best period arrived towards the end, during the Janusz Wójcik era (1997–99).

After his football career was over, Trzeciak stayed in Andalusia with former club Poli Ejido, coaching its junior teams.