Anadolu Agency says today the suspects were taken into custody following simultaneous raids on 41 homes in two low-income Istanbul neighborhoods.
There was no information on the suspects or their nationalities.
Last year, Turkey suffered a series of deadly attacks carried out by IS or Kurdish militants and has stepped up anti-terrorism operations across the country.
Some 750 people with alleged IS links were detained in a major police sweep in 29 Turkish provinces earlier this month.
IS claimed responsibility for a New Year's mass shooting at an Istanbul nightclub that killed 39 people.