| 1860 |
the first metal industry company starts production, later to become the "Kochs Adler-Werke" |
| 1867 |
establishment of the "Dürkopp-Werke" company |
| 1872 |
Pastor Friedrich von Bodelschwingh becomes head of Bethel, a charitable institution founded in 1867 |
| 1879 |
the town purchases the ruin of Sparrenburg Castle from the Prussian state for 8934.90 Marks. Rebuilding begins |
| 1891 |
Dr. August Oetker takes over Aschoff's chemist's shop, here developing his well-known pre-packed baking powder |
| 1900 |
inauguration of tram services in Bielefeld |
| 1904 |
opening of the municipal theatre, construction of the town hall at Schillerplatz and of the post office at Herforder Straße |
| 1910 |
construction of the main railway station |
| 1917 |
official opening of the farmhouse museum at Ochsenheide |
| 1930 |
Bielefeld becomes a city by incorporating parts of neighbouring communities |
| 1930 |
opening of the "Rudolf Oetker-Halle" concert hall, famous for its excellent acoustics |
| 1933 |
banning of unions and the Social Democrat "Volkswacht", dissolution of democratic political parties |
| 1938 |
the synagogue is burnt down in the Third Reich's pogrom night |
| 1944 |
heaviest air strike on Bielefeld on September 30. Large area of the town turns to rubble; more than 600 people die |
| 1945 |
entry of American troops in April. The British take over the military administration in May |
| 1946 |
Artur Ladebeck becomes the first democratically elected mayor |
| 1953 |
official twinning with the English town of Rochdale |
| 1968 |
the foundation stone is laid for Bielefeld University. The city art gallery is opened |
| 1968 |
"Arminia Bielefeld" football club reach the First Division |
| 1973 |
Northrhine-Westphalian boundary changes: the town of Bielefeld and its district are merged |
| 1974 |
end of production at the Bielefeld site of Ravensberger Spinnerei |
| 1990 |
opening of the civic hall |
| 1991 |
official opening of the Stadtbahn tram network, running underground in the city centre |
| 1993 |
opening of the Seidensticker Hall |
| 1994 |
the History Museum is opened in the Ravensberger Spinnerei park |
| 1995 |
official handing over of the arts and crafts collection Huelsmann in the former manager's mansion of the Ravensberger Spinnerei |