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Nikola Hajdin (Никола Хајдин; born in Vrbovsko, in present-day Croatia, on April 4, 1923) is President of the Serbian Academy of Sciences and Arts, (since 2003) as a member of the Department of Technical Sciences.
As a construction engineer, he built many bridges in former Yugoslavia; most prominently the New Railway Bridge in Belgrade and the Liberty Bridge in Novi Sad. Nikola Hajdin also designed bridge which was built in 2007 in Poland - the Solidarity Bridge in Płock over the Vistula River.
Hajdin is a retired professor of the University of Belgrade Faculty of Civil Engineering. He holds masters and doctoral degreed from the same school. He is also a member of the European Academy of Sciences and Arts.