Adventures in Time and Space was an anthology of SF stories edited by Raymond J. Healy and J. Francis McComas and published in 1946. It arguably collected the very best of short SF from the Golden Age of 1937-1945 and was a pivotal in showing the next several generations of fans what that era had produced.
A second edition was also published in 1946 that eliminated the last five stories. A Modern Library edition was issued in 1957.
In Astounding Science Fiction readers' surveys in both 1952 and 1956, it was rated the best SF book ever published.