In this research, some of the physical properties of some citrus species (orange, mandarin, grapefruit, lemon and bitter orange) such as size, mass, volume, density, sphericity and projection area and terminal velocities of the fruits in water, hydrodynamic properties such as friction force and lift force in water were determined. To determine the dimensions and the projected area, each fruit image was obtained from the three coordinates, and then analyzed using Image Tool 3.0 image processing software. Geometric mean diameter, sphericity and surface area values were calculated based on data. The mass, volume, and density of fruit were also measured. According to the results obtained in the experiments, the terminal velocity in water was measured the highest in the bitter orange fruit (0.55 m s-1) and the lowest in the lemon fruit (0.21 m s-1). According to the results of Pearson correlation matrix analysis showing the relation of parameters to each other, the correlation between terminal velocity in water and fruit density was found to be important for all citrus species tested.