Sylwester Kaliski (19 December 1925 – 16 September 1978) was a Polish engineer, professor and military general.

He developed the theory of continuous amplification of ultra and hyper-sounds in semiconductive crystals and obtained plasma temperature of tens of millions of kelvins using laser impulse.

It has been speculated that Kaliski was killed by the Soviet KGB, as he headed the Polish clandestine program of developing thermonuclear devices intended for military use.

The program began on orders from the highest levels of Polish communists and was reportedly opposed by the Soviet Union.

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