Keldysh (Russian: Келдыш) can refer to one of the following.
Leonid Keldysh (b. 1931), a Russian physicist, former director of the Lebedev Physical Institute (1988-1994), now physics faculty at Texas A&M University
Lyudmila Keldysh (1904–1976), mathematician, sister of Mstislav, wife of Pyotr Novikov
Yuri Keldysh (1907-1995), a Russian musician
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