The stations currently offer paid Wi-Fi, but it will be offered for free this summer thanks to Google.
Google Offers is sponsoring the program through September 7, but officials hope to extend the service through other sponsors.
The free service is at the A, C and E station at 14th Street, the L station at Sixth Avenue, the L station at Eighth Avenue, the F and M station at 14th Street, the 1, 2 and 3 station at 14th Street and the C and E station at 23rd Street.
The MTA plans to have Wi-Fi at all stations by 2016.
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