A page has been launched on Facebook to help find the missing student.
Aidan Lynch, 20-years-old and from Cork, was last seen at 12.30pm in Krakow on Wednesday.
He was wearing a red and white checked shirt and is 6ft 4in in height.
The Facebook page is here for further information and updates.
UCC student Aidan Lynch missing in #Krakow. Last seen 12.30pm Wed. at Politechnika Krakowska. Please RT. pic.twitter.com/ZG3LXGcQaj
— UCC Students’ Union (@UCCSU) August 28, 2014