Most standard oil spill modeling programs neglect the effects of Langmuir circulation (LC), The authors have identified three areas where LC effects may be important in spill behavior. These three areas are spreading, dispersion, and transport, LC will cause the slick to break into windrows when the wind-row formation velocity is comparable to Fay and other spreading forces. Oil dispersion is likely to be enhanced, with droplets carried to greater depth and distributed non-uniformly. Transport velocities for different parts of the slick will vary because of LC, a phenomenon that also occurs because of other factors.