Abstract <p>Currently, there are no reliable computational models that take into account the influence of the velocity field inside of a droplet on the character of its spread over a wall. It is of interest to describe the collective interaction of droplets after their falling onto a wall. The convection of water in a sessile drop after the fall of another droplet onto it is experimentally studied in this work. Instantaneous velocity fields are obtained by the PIV method. It has been found that the interaction of the droplets leads to the generation of an intense vortex and the distortion of the initial (before the fall of the droplet) toroidal flow structure. It has been shown that, depending on the Weber number (We), qualitatively different regimes of sessile drop deformation are observed: from damped oscillations at low We numbers to radial spreading with the formation of “fingers” at high We numbers. After the contact line of the sessile drop stops moving, the liquid motion inside of the drop continues for a long time and is characterized by viscous forces, with the characteristic time being determined by the ratio between inertial and viscous forces. Variations in average dimensionless velocity <i>V</i>** in the droplet have been determined as depending on dimensionless time <i>t</i>** taking into account the We number. The obtained dependences are satisfactorily generalized using dimensionless complex <i>t</i>**(We)^0.25. The obtained results may be useful for improving existing models that take into account interactions of droplets after their falling onto a wall.</p>