Marian Danysz (born 17.03.1909) is a Polish physicist and a member of the Polish Academy of Sciences (1961). He was born in Paris. He graduated from the Technical University in Warsaw. In 1950—52 he worked in England (Liverpool, Bristol); after returning to Poland he worked at Warsaw University (professor from 1954); in 1956—59 he was deputy director of the Joint Institute for Nuclear Research (Dubna); and since 1960 he has worked at the Institute of Nuclear Research in Warsaw.
His research concerned nuclear physics and the physics of elementary particles, in particular the physics of hypernuclei. Together with J. Pniewski he discovered hypernuclei in 1952 and double hypernuclei in 1963. His research has also dealt with the properties of hyperons.
State Prize of the Polish People's Republic (1966).