Two buildings in Sheffield are being searched by counter-terrorist officers after the 21-year-old from the city was held late on Friday.
It follows the arrests of four men in the South Yorkshire city and nearby Chesterfield in Derbyshire on December 19.
A spokesman for Counter Terrorism Policing North East (CTPNE) said: “The 21-year-old man, from the Fir Vale area of Sheffield, was arrested on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism under Section 41 of the Terrorism Act 2000.
“The intelligence-led arrest was made in the Firth Park area of Sheffield at approximately 11pm on Friday evening.
Leeds thunderstorms warning as Met Office shares latest weather forecast
Bloody machete attack on busy Leeds street left man scarred for life
York Road incident: Police appeal after pedestrian killed in crash outside Leeds Dogs Trust
Leeds Bradford Airport: Full statement on August security staff strike
Lamborghini pictured with car on top of its bonnet at busy Leeds junction following crash
“Two addresses, a residential address in Fir Vale and a business address in Firth Park, are currently being searched by officers.”
Two of the men arrested on December 19 - Chesterfield fish and chip shop owner Andy Star, 31, and Farhad Salah, 22, from Sheffield - have been charged with one count of engaging in the preparation of an act of terrorism.
The men, both Kurdish Iraqis, are due to appear at the Old Bailey in London on January 19.
A 36-year-old man from Burngreave in Sheffield also remains in custody, while a 41-year-old from Meersbrook in Sheffield was released on Saturday, police said.