A bicycle operating device comprises a base member, an operating member, and a hydraulic unit. The operating member is pivotally coupled to the base member about a pivot axis. The hydraulic unit is provided on the base member and comprises a hydraulic cylinder, a piston, and a hydraulic reservoir. The hydraulic cylinder includes a cylinder bore being at least partly provided above the pivot axis in a mounting state where the bicycle operating device is mounted to a bicycle. The piston is movably provided in the cylinder bore. The cylinder bore and the piston define a hydraulic chamber. The hydraulic reservoir includes a reservoir chamber connected to the hydraulic chamber. The reservoir chamber is provided above the cylinder bore without overlapping with the cylinder bore in a transverse direction parallel to the pivot axis in the mounting state.