This paper deals with the wake galloping in tandem cables of cable-stayed bridges under skewed wind direction. Wind tunnel experiments by using conventional smooth surface circular cables and dimpled surface circular cables have been carried out in both uniform and turbulent flows. It was ascertained from test results that the exciting force of wake galloping decreases with the increase of turbulence intensity in the turbulent flow. It can also be seen that lift and drag coefficients are strongly dependent on Reynolds number and that Reynolds number corresponding to the minimum lift coefficient is one of the most significant parameters for wake galloping when wind direction is skewed.