Larger and taller wind turbines are featured by larger head masses and longer towers of the rotor-nacelle assembly (RNA), both of which result in a lower natural frequency, decreasing the critical wind speed and increasing the probability of vortex resonance. While free-standing towers, such as chimneys, have been extensively investigated for vortex-induced vibration (VIV), the completed wind turbine as a structure has not yet been fully investigated for VIV. An ongoing field measurement campaign and research project to further validate the current predictive models is being conducted in Østerild, Denmark, as part of a transfer project with Siemens Gamesa Renewable Energy. The measurements are performed on two wind turbine prototypes SG 14-222 DD (SG 14) and SG 8.0-167 DD. A breakthrough of this campaign is the wind pressure measurements along the perimeter of the tower of SG 14 at two heights, which allow a direct measurement of the wind load in the same time as the response measurement. The measurement campaign for SG 14 is planned for two years and will provide extensive measurement data sets in different configurations of wind turbines: free-standing, installation, operating, and non-operating. In addition, the measurement campaign will consider conditions that are difficult to reproduce in the wind tunnel: Transcritical range of Reynolds numbers and smooth surface structure. The general purpose of this research is to study in detail the VIV in the real-life environment of a wind turbine and to verify the concept of VIV modeling considering the mode shapes of the wind turbine. The research is supported by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the projects Nr. 493357786 and 426322127 and CICIND (International Committee for Industrial Construction) through the CICIND research project “Reynolds number disparity and its effect on vortex excitation – Insight from full-scale tests at wind turbine towers”