Asger Skovgaard Ostenfeld (13 October 1866 – 23 September 1931) was a Danish civil engineer who specialized in the theory of steel and reinforced concrete structures.
In 1894, he designed the Langelinie Bridge at Østerport Station which at the time was the largest structure in Denmark built by a Danish engineer.
Ostenfeld published a number of textbooks on the theory of structure which were widely read outside Denmark.
His method represented significant progress in that "it enables previously analysed structural elements so to speak, to be built on".
Also contributions to Danish and foreign journals on Deformationsmetode, Aabne Broers Sidestivhed, Beregning af Søjler.