|1979 ||Humanist of the Year Award|
with another five Czechoslovak dissidents
awarded by the Church of Humanism ; New York City, U.S.A.
|1977 ||The International Freedom Prize for Charter 77|
awarded by the International Freedom Conference ; Oslo, Norway
|1970 ||OBIE: Off-Broadway Theatre Award 1969/70|
awarded in the Distinguished Playwriting Category ; New York City, U.S.A.
|1968 ||The Austrian State Prize for European Literature|
awarded by the Federal Ministry of Education and Art; Vienna, Austria
|1968 ||OBIE: Off-Broadway Theatre Award 1967/68|
awarded in the Best Foreign Play Category ; New York City, U.S.A.