In this paper, a dual-band push-push voltage-controlled oscillator implemented in the 0.18-µm CMOS process for V-band applications is presented. By using a forth order resonance network composed of symmetric inductors and varactors and a push-push topology, the oscillation frequencies of the proposed circuit can be switched with only one control signal between two bands. And the second order harmonic is extracted from the central taps of inductors to achieve the frequencies of two V-band operations. The tuning ranges of the proposed voltage-controlled oscillator are from 67.78 to 69.42 GHz and from 52.2 to 54.7 GHz, respectively. The measured phase noise at 1 MHz frequency offset are −86.4 dBc/Hz and −90.5 dBc/Hz for 69.42 GHz and 54.7 GHz output frequencies, while the corresponding phase noises at 10 MHz frequency offset are −108.4 dBc/Hz and −112 dBc/Hz, respectively. The core circuit consumes a 12.96 mW dc power from a 1.8-V supply.