The art on all these stamps is so bizarro world fantastic that I'm considering becoming a philatelist.

From a Soviet Science Fiction stamp series, 1967

(via VintagePrintable1/Flickr)

The spacecraft from From the Earth to the Moon by Jules Verne on a Hungarian airmail stamp, 1969

(via Stampcommunity)

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UFOs from Paraguay, 1978

(via Fortean Times)

Vietnam, 1988

(via Fortean Times)

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From the Mysteries of the Universe series, Maldives, 1992

(via Edward Mordrake)

Space Fantasy, USA, 1993

(via USA-stamps)

24kt gold Star Trek stamps from Guyana, 1994

(via Sci-FiStamps)

An Alien- and Star Wars-themed set, Togo, 1994

(via Fantlab)

H.G. Wells novels, UK, 1995

(via eBay)

Lost In Space, Guinea, 1998

(via Fandom and StampCommunity)

Space Discovery, USA, 1998

(via Philosateleia)

Dalek, UK, 1999

(via Combom)

UFO Stamps from Tanzania, 1999

(via UFO Stamps and Mountain Stamp)

A sci-fi set from Israel, commemorating H. G. Wells, Isaac Asimov and Jules Verne, printed in 2000

(via Trendclub)

Australia, 2000

(via Stamp Mall)

UFO stamps from Kalmykia, 2000

(via eBay)

Tajikistan, 2000

(via Fortean Times)

Tatarstan, 2002

(via Fortean Times)

Aliens series from the Komi Republic, 2002

(via SciFi Stamps)

Journey To The Center Of The Earth and 20,000 Leagues Under The Sea by Jules Verne, Lesotho, 2005

(via Cultureduca)

Star Wars stamp set, commemorating the 30th anniversary of the theatrical release of Star Wars Episode IV: A New Hope, produced by the United States Postal Service in 2007

(via StarWars Wiki)

Star Trek: The Next Generation, Palau, 2008

(via Sci-Fi Stamps)

Star Trek stamps from the Federated States of Micronesia, 2008

(via Philatelia.ru)

A set commemorating iconic British marionette-based science-fiction series, 2011

(via Scstamps)

Doctor Who 50th Anniversary stamps, UK, 2013

(via Whatculture)

A stamp featuring the 20th anniversary of the World Symposium on UFOs, San Marino, 2013

(via Numismatica e storia)