The suspects, whose nationalities were not disclosed, were captured yesterday as they tried enter the Elbeyli district of Turkey's southern Kilis province.
"Twenty-three people suspected of being Daesh (IS) terror group members, together with 21 children, were caught," said the army in a statement, without giving any other details.
Turkey has over the last year been told by its Western allies to urgently step up efforts to stop the flow of jihadists across its borders to and from Syria.
The army reported yesterday that it had on Friday also captured six IS suspects, along with eight children, who were trying to cross illegally from Syria to Turkey in the same area.