  We analyze cosmic superstring models in light of NANOGrav 15-year pulsar
timing data. A good fit is found for a string tension $G \mu \sim 10^{-12} -
10^{-11}$ and a string intercommutation probability $p \sim 10^{-3} - 10^{-1}$.
Extrapolation to higher frequencies assuming standard Big Bang cosmology is
compatible at the 68\% CL with the current LIGO/Virgo/KAGRA upper limit on a
stochastic gravitational wave background in the 10 to 100 Hz range. The
superstring interpretation of the NANOGrav data would be robustly testable by
future experiments even in modified cosmological scenarios.
