Electronic version of an article published in International Journal of Number Theory Volume 04, Issue 04, August 2008, pp. 539-547. DOI: 10.1142/S1793042108001511. Copyright © 2008 World Scientific Publishing Company: http://www.worldscientific.com/worldscinet/ijnt
We give q-analogues of Wilson's theorem for the primes congruent to 1 and 3 modulo 4, respectively. Also q-analogues of two congruences due to Mordell and Chowla are established.