A low noise oscillator is disclosed wherein the collector and base of a transistor are respectively biased at different voltages from a common voltage source to be conditioned for generating a high frequency oscillation with a resonant circuit connected to the emitter and collector. The high frequency oscillation developed at the base of the transistor is coupled to ground. A capacitive circuit is coupled between the collector and base of the transistor to eliminate the effect of a voltage-dependent capacitance inherently present in the transistor between its collector and base on the frequency of the oscillation in order to reduce the level of noise introduced to sidebands.