Negative ion photoelectron spectra of SiN- have been recorded using the 355 nm (3.493 eV) and 266 nm (4.661 eV) photodetachment wavelengths. The spectra exhibit resolved vibrational features corresponding to transitions to the X (2)Sigma(+) and A (2)Pi states of SiN. Franck-Condon analyses yield the first experimental spectroscopic parameters, r(e), and (omega(e) for the anion ground state, X (1)Sigma(+). We also determined the first experimental adiabatic electron affinity as 2.949 +/- 0.008 eV. The anion dissociation energy D-0(SiN-) is then obtained from the electron affinities of Si and SiN and the dissociation energy of the neutral.