Johann Nikuradse (Georgian: ივანე ნიკურაძე, Ivane Nikuradze) (November 20, 1894 – July 18, 1979) was a Georgia-born German engineer and physicist.
His brother, Alexander Nikuradse, was also a Germany-based physicist and geopolitician known for his ties with Alfred Rosenberg and for his role in saving many Georgians during World War II.
He was born in Samtredia, Georgia (then part of the Kutais Governorate, Imperial Russia) and studied at Kutaisi.
The 1921 Sovietization of Georgia precluded his return to homeland and Nikuradse naturalized as a German citizen.
[2] Nikuradse carefully measured the friction that a fluid experiences in turbulent flow through a rough pipe.