Unknown Worlds (Australia) (about)
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| 1942 |  Mar |
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| 1943 |  May |
 Oct |
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| 1944 |  Jan |
 May |
 Autumn |
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| 1945 |  Autumn |
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| 1946 |  Winter |
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| 1947 |  Summer |
 Winter |
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| 1948 |  Summer |
 Winter |
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| 1949 |  Summer |
 Winter |
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Unknown Worlds of Science Fiction
Contents pages have “Stan Lee Presents: Unknown Worlds of Science Fiction.”
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1975 | v1 #1 Jan |
 v1 #2 Mar |
 v1 #3 May |
 v1 #4 Jul |
 v1 #5 Sep |
v1 #6 Dec |
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| 1976 | v 1 | ||||||||||||
— Unknown (UK)
Strictly speaking the first 18 issues were titled Street & Smith’s Unknown (UK) but as the magazine is universally known as Unknown (UK) it has been decided to index it as such.
Publishers: Atlas Publishing & Distributing Co., Ltd.; London, England.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1939 |  v2 #1 Sep |
 v2 #2 Oct |
 v2 #3 Nov |
 v2 #4 Dec |
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| 1940 |  v2 #5 Jan |
 v2 #6 Feb |
 v3 #1 Mar |
 v3 #2 Apr |
 v3 #3 May |
 v3 #4 Jun |
 v3 #5 Jul |
 v3 #6 Aug |
 v4 #1 Sep |
 v4 #2 Oct |
 v4 #3 Nov |
 v4 #4 Dec |
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| 1941 |  v4 #5 Feb |
 v4 #6 Jul |
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— Unknown Worlds (UK)
Title changed from Unknown (UK).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1942 |  v5 #5 Mar |
 v6 #1 Jun |
 v6 #3 Oct |
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| 1943 |  v6 #4 Feb |
 v6 #5 May |
 Oct |
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| 1944 |  Jan |
 May |
 Autumn |
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| 1945 |  v3 #4 Spring |
 v3 #5 Autumn |
 v3 #6 Winter |
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| 1946 |  v3 #7 Summer |
 v3 #8 Winter |
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| 1947 |  v3 #9 Spring |
 v3 #10 Summer |
 v3 #11 Winter |
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| 1948 |  v3 #12 Spring |
 v4 #1 Summer |
 v4 #2 Winter |
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| 1949 |  v4 #3 Spring |
 v4 #4 Summer |
 v4 #5 Winter |
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— From Unknown Worlds (UK)
This magazine was published in both a large pulp format and a hardback edition (for 6/-).
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| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1952 |   [X] |
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The magazine was initially called The Journal of Unlikely Entomology, but switched with #6 to a changing magazine title under the umbrella name of Unlikely Story.
— The Journal of Unlikely Entomology
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 2011 |  # 1 May |
 # 2 Nov |
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| 2012 |  # 2.5 Feb |
 # 3 May |
 # 3.5 Aug |
 # 4 Nov |
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| 2013 |  # 5 May |
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— Unlikely Story
Title changed from The Journal of Unlikely Entomology, although the actual magazine title changes from issue to issue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 2013 |  # 6 Aug |
 # 7 Nov |
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| 2014 |  # 8 Feb |
 # 8.5 Apr |
 # 9 Jun |
 #10 Nov |
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| 2015 |  #11 Feb |
 #11.5 Apr |
 #12 Oct |
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| 2016 |  #12.5 Jun |
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