A method of damping oscillations in a multi-rotor wind turbine, the wind turbine comprising a wind turbine support structure and at least a first nacelle with a first rotor and a second nacelle with a second rotor, at least two rotor arms are attached to the wind turbine support structure, the first nacelle and the second nacelle being carried by the respective rotor arms, at a position away from a central longitudinal axis of the wind turbine support structure, the method comprising the steps of: receiving motion data ( ÿ 0, ÿ 1, ÿ 2) representing a movement of the first nacelle and of the second nacelle, the motion data ( ÿ 0, ÿ 1, ÿ 2) comprises acceleration signals ( ÿ 1, ÿ 2) from accelerometers associated with the respective nacelles (111, 121), processing the received motion data ( ÿ 0, ÿ 1, ÿ 2) to determine at least two prominent oscillation modes of the wind turbine support structure, one of the at least two prominent oscillation modes is determined to be a tower torsion mode, and one of the at least two prominent oscillation modes is determined to be a tower fore-aft mode, for each prominent oscillation mode selecting a corresponding damping algorithm, the corresponding damping algorithm for the tower torsion mode at least includes subtracting the acceleration signal ( ÿ 1) of the first nacelle from the acceleration signal ( ÿ 2) of the second nacelle, and the corresponding damping algorithm for the tower fore-aft mode at least includes summing the acceleration signal ( ÿ 1) of the first nacelle and the acceleration signal ( ÿ 2) of the second nacelle, based on each one of the selected damping algorithms and the received motion data ( ÿ 0, ÿ 1, ÿ 2), generate partial pitch control signals for a pitch controller (115, 125) of at least one of the rotors (110, 120), the partial pitch control signals comprises a first partial pitch control signal for the corresponding damping algorithm for the tower torsion mode, and a second partial pitch control signal for the corresponding damping algorithm for the tower fore-aft mode at least includes summing the acceleration signal ( ÿ 1) of the first nacelle from the acceleration signal ( ÿ 2) of the second nacelle, combining the generated partial pitch control signals into a combined pitch control signal (Δ θ 1, Δ θ 2) for the pitch controller (115, 125) of the at least one of the rotors (110, 120), and based on the combined pitch control signal (Δ θ 1, Δ θ 2), instructing the respective pitch controller (115, 125) to adapt a pitch of the at least one of the rotors (110, 120). receiving motion data ( ÿ 0, ÿ 1, ÿ 2) representing a movement of the first nacelle and of the second nacelle, the motion data ( ÿ 0, ÿ 1, ÿ 2) comprises acceleration signals ( ÿ 1, ÿ 2) from accelerometers associated with the respective nacelles (111, 121), processing the received motion data ( ÿ 0, ÿ 1, ÿ 2) to determine at least two prominent oscillation modes of the wind turbine support structure, one of the at least two prominent oscillation modes is determined to be a tower torsion mode, and one of the at least two prominent oscillation modes is determined to be a tower fore-aft mode, for each prominent oscillation mode selecting a corresponding damping algorithm, the corresponding damping algorithm for the tower torsion mode at least includes subtracting the acceleration signal ( ÿ 1) of the first nacelle from the acceleration signal ( ÿ 2) of the second nacelle, and the corresponding damping algorithm for the tower fore-aft mode at least includes summing the acceleration signal ( ÿ 1) of the first nacelle and the acceleration signal ( ÿ 2) of the second nacelle, based on each one of the selected damping algorithms and the received motion data ( ÿ 0, ÿ 1, ÿ 2), generate partial pitch control signals for a pitch controller (115, 125) of at least one of the rotors (110, 120), the partial pitch control signals comprises a first partial pitch control signal for the corresponding damping algorithm for the tower torsion mode, and a second partial pitch control signal for the corresponding damping algorithm for the tower fore-aft mode at least includes summing the acceleration signal ( ÿ 1) of the first nacelle from the acceleration signal ( ÿ 2) of the second nacelle, combining the generated partial pitch control signals into a combined pitch control signal (Δ θ 1, Δ θ 2) for the pitch controller (115, 125) of the at least one of the rotors (110, 120), and based on the combined pitch control signal (Δ θ 1, Δ θ 2), instructing the respective pitch controller (115, 125) to adapt a pitch of the at least one of the rotors (110, 120).