Preparation of valuable and certified carrot and parsley seed material requires the knowledge of basic physical properties of seeds of the basic species components and of the other components of a mixture (dirt, seeds of other plant species, etc.). Knowledge of the physical characteristics of the seeds is also required in the selection and setting of technical and technological parameters of cleaning and separation or other treatments aimed at refining seed. This paper summarizes and compares selected group of physical properties and particle size distribution of carrot and parsley seeds obtained in combine harvest. A variation was demonstrated in certain physical characteristics of the carrot and parsley seeds, and the characteristics are mainly related to the mass (bulk density and shaken density) and the geometric dimensions of the most numerous and representative dimensional fractions. Particle size distribution analysis of both vegetable seeds, carried out in parallel on a sifter and a vibrating sieve, showed that the largest and the most representative from the viewpoint of sowing value group of seeds were carrot seeds in the sizes of: 1.3, 1.5 and 1.7 mm. The total amount of these three sizes accounted for approximately 78% of pre-treated seeds. In the case of seeds of parsley were most numerous group were seeds of the two sizes of 1.1 and 1.3 mm, and their combined share in the total weight of the seeds was approximately 84,46%.