A two-laser (ir overtone pump and uv laser-induced fluorescence probe) technique has been used to measure vibrational relaxation rate coefficients for NO (X (II)-I-2, upsilon=2 and 1) with various collision partners at room temperature. The relaxation of upsilon = 2 by NO, H-2, and NH3 has also been measured at 240 K. The relaxation of upsilon = 2 by NO is dominated by vibration-to-vibration (V-V) transfer and this process has not previously been measured below room temperature. The probability for V-V transfer increases with decreasing temperature, indicating that attractive forces play a key role in this process. Different physical mechanisms for NO vibrational energy transfer are discussed in light of the available data.