The B.Sc. Thesis deals with the design of reinforced concrete column under conditions of normal use and under conditions of fire. The treated column is located in the ground floor of a multi-storey office building. At the ceiling height the columns are interconnected with reinforced concrete beams and form reinforced concrete spatial frames. Frames together with the walls represent structural systems for the transfer of loads in vertical and horizontal directions. It is determined that the stiffness of columns in the horizontal direction is compared to the rigidity of the walls negligible, so we assume that columns are only involved in taking vertical loads, while the takeover of the load due to the effect of wind and earthquake is not involved. First, we designed a column to axial and shear loads in normal conditions of use. For the design we must take into account the effects of second-order theory. The appropriate design in case of fire. Fire resistance of reinforced concrete column is estimated using tabulated values. It is determined that the fire resistance of the column cross-section of 40/40 cm according to the criterion load is R 120, of column cross-section 35/35 cm is R 90 and column with section 30/30 cm is R 60.