Yes, possibly. Jun, is one of the surviving Spartans. There might be more but, here hasn't been anything saying more Spartans lived. There are three spartans aboard the Spirit of Fire from Halo Wars
Correct me if I am wrong, but Fred,Kelly, Linda as well as the other spartan III's from the Ghosts of Onyx Book are also still alive, Just stuck in a Micro Dyson Sphere.
And also Master chief (john 117) is still alive as seen in the halo 4 debut trailer