| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1942 | [X] | ||||||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 2001 | #29 Winter ’01/’02 |
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Subtitled “Worlds of Science Fiction” when it started, the “Worlds of” part came and went during the Fifties, often being placed on the cover in a manner that allowed one to misread the full title as “Worlds of If”. Robert Guinn seems to have been a bit uncertain of the exact title after he bought it in 1959. The title is given in a variety of ways in the indicia, annual statements of ownership, etc.; it is worth noting, however, that Guinn never thought it was “Worlds of If”. Universal seems to have also been confused about the magazine’s title for a while; they finally settled on “Worlds of If” in 1972 and we have listed the subsequent issues under that title.
— If
Publishers: Quinn Publishing Company, Inc.; Kingston, NY, Mar 1952; Quinn Publishing Company, Inc.; Buffalo, NY, May 1952 – Feb 1959; Digest Productions Corporation; New York, Jul 1959 – May 1963; Galaxy Publishing Corp.; New York, Jul 1963 – May 1969; Universal Publishing & Distributing Corporation; New York, Jul 1969 – Jul 1970; UPD Publishing Corp.; New York, Sep 1970 – Feb 1972.
— Worlds of If
Title changed from If. The last issue was a revival as a semi-professional magazine.
Publishers: UPD Publishing Corporation; New York, Mar 1972 – Nov 1974; STF Corporation; Hicksville, NY, Sep 1986.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1972 |  v21 #4 #159 Mar/Apr |
 v21 #5 #160 May/Jun |
 v21 #6 #161 Jul/Aug |
 v21 #7 #162 Sep/Oct |
 v21 #8 #163 Nov/Dec |
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| 1973 |  v21 #9 #164 Jan/Feb |
 v21 #10 #165 Mar/Apr |
 v21 #11 #166 May/Jun |
 v21 #12 #166 Jul/Aug |
 v22 #1 #168 Sep/Oct |
 v22 #2 #169 Nov/Dec |
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| 1974 |  v22 #3 #170 Jan/Feb |
 v22 #4 #171 Mar/Apr |
 v22 #5 #172 May/Jun |
 v22 #6 #173 Jul/Aug |
 v22 #7 #174 Sep/Oct |
 v22 #8 #175 Nov/Dec |
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| 1986 |  v23 #1 #176 Sep/Nov |
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