Worlds of When

{{Short description|Anthology of science fiction short stories by Geoff Conklin}}

{{Infobox book |

| name = Worlds of When

| title_orig =

| translator =

| image = Worlds of When.jpg

| image_size = 200px

| caption = Cover of the first edition.

| editor= Groff Conklin

| cover_artist = John Schoenherr

| country = United States

| language = English

| series =

| genre = Science fiction

| publisher = Pyramid Books

| release_date = 1962

| english_release_date =

| media_type = Print (paperback)

| pages = 159

| dewey=

| congress=

| oclc=

| preceded_by =

| followed_by =

}}

Worlds of When is an anthology of science fiction short stories edited by Groff Conklin. It was first published in paperback by Pyramid Books in May 1962.{{ISFDB title|id= 34609}}

The book collects four novelettes and one short story by various science fiction authors, together with an introductory note by the editor. The stories were previously published from 1954 to 1961 in various science fiction and other magazines.