The paper presents a method of mathematical modelling of the shape of the surface of the egg shell, egg yolks and air chamber. For modelling of the shape, eggs with dimensions: length 60; 57.2; 56.4 mm, width 47.1; 42.3; 41 mm and thickness of 46; 41.1 and 39.2 mm were selected. Two Bézier patches were used to map the shape of the surface of the egg shell, yolk and the air chamber. Calculation and visualization was carried out in Mathcad computer program. The developed mathematical model of the 3D shape of chicken eggs and its basic elements can be used for modelling the processes occurring in their production and processing.