A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency set by the frequency control data by using a resonator, and a processor that is configured to perform a signal process on input frequency control data to output frequency control data. The processor is configured to obtain a pre-estimated value x̂−(k) at a time step k by adding a post-estimated value x̂(k−1) and a correction value D(k−1) at a time step k−1 together during a process of updating a pre-estimated value in a Karman filter process, and perform aging correction on the frequency control data on the basis of a result of the Karman filter process.