The paper gives a short overview of the chronological development of the ammonia production technology from the early days to the present. Based on the laboratory experiments of Fritz Haber in Karlsruhe, Carl Bosch and co-workers developed the technical production process in the Badische Anilin- und Soda-Fabrik in only 4 years. This development is a milestone in the history of chemical engineering, opened a new phase in technical chemistry by laying the foundations for high pressure technology and became exemplary for all subsequent chemical mass production processes. Until 1950 coal and coke dominated as feedstock, when in the United States a shift to natural gas began. In Europe coal was first replaced by naphtha and to a minor extent by heavy oil fractions. When in the mid sixties large gas fields were found in Europe there was switched also to natural gas. Compared to oil fractions and coal, natural gas has significant advantages regarding energy consumption and investment. For this reason it is now worldwide the prevailing feedstock. Also mid of the sixties the concept of the energy self-sufficient, highly integrated single train plant evolved. Further improvements by 1980 resulted in lower energy consumption and investment costs and larger plant capacities up to 1800 mtpd. Some new developments are described in short and finally an outlook for the future perspectives is given.