Abstract NASA’s mission Dragonfly to Titan is scheduled for launch in 2028 with arrival in 2034 to study Titan’s prebiotic chemistry and habitability. We propose a radio science experiment for Dragonfly, in which radiometric tracking of the rotorcraft from the Deep Space Network, already baselined for communications and navigation, is used as a precision geodetic instrument to measure Titan’s rotational state and tidal deformations, without any modification to the spacecraft. We perform simulations of the experiment and compute its expected performances in terms of the uncertainties on the retrieved geophysical parameters. Our results indicate that the rotation and tidal parameters can be retrieved with outstanding precision, sufficient to discriminate between models with and without a subsurface ocean, whose existence has been recently questioned. This experiment would be the first high‐precision geodetic experiment from a landed asset on an icy moon, and would provide dramatic improvements in our knowledge of Titan’s interior.