Martian

"Martian" was a generic term for any inhabitant of the planet Mars. The term was applied to several species, (TV: Cold War, PROSE: The Secret of the Mountain, et al) in part because of the planet's multiple conflicting and overlapping timelines (PROSE: The Last Resort) and hypothetical realities (PROSE: The Ninnies on Putney Common)

Native Martians
Several sentient species evolved on Mars. (TV: The Ice Warriors, The Seeds of Death, et al) These included the Ice Warriors, (TV: The Ice Warriors) who the Eleventh Doctor called "the Martian race"; (TV: Cold War) the Gandorans; (AUDIO: Lords of the Red Planet) the Ninnies; (PROSE: The Ninnies on Putney Common) and another type simply called "Martians." (PROSE: Enter Wildthyme)

There were also non-sentient species that evolved on Mars, such as Martian fungi (TV: The Seeds of Death) and at least one type of virus. (TV: The Waters of Mars)

Human Martians
By the 22nd century, Mars had been colonised by humans, who, according to one account, pushed the native Ice Warriors into poverty. (PROSE: Fear Itself) Another account claimed that humanity had colonised Mars unimpeded when — in the words of Harold — after "something to do with T-Mat on the Moon", "centuries" before the 23rd century, a whole fleet of Ice Warriors were — according to what Gregson Grenville had learnt in school — "all melted when their invasion fleet spiralled into the sun".

This account showed extant Ice Warriors, but all were in suspended animation for — according to the Eighth Doctor — "many millions of years" during the 22nd century. (AUDIO: Deimos)

According to another account, the Tenth Doctor described the Ice Warriors as "legends on Mars from long ago" after the first off-world human colony was founded on Mars in 2058. (TV: The Waters of Mars)

Once humanity had made Earth itself uninhabitable, the Usurians saw to it that the humans could move to Mars. (TV: The Sun Makers)

Many humans considered themselves "Martian" after colonisation, as there came a point when humans were regularly being born there. Vel Karneen, commander of Space Army, identified himself as a Martian, for instance (PROSE: The Secret of the Mountain) — as did the second-in-command of the ADF, Reb Shavron. (PROSE: Terror Task Force)

Martian droids
At some point, Martian droids were paid in something called "default". (TV: Bad Wolf)

As colloquialism
Prior to colonisation, many humans simply interchanged the word Martian for the term alien — much like "flying saucer" was used as a generic term for alien spacecraft. For example, Donna Noble referred to the Tenth Doctor as a Martian before understanding he was, in fact, a Time Lord. (TV: The Runaway Bride) Likewise, Lucie Miller suggested to Eighth Doctor that she could be a Martian if she was alien. (AUDIO: Blood of the Daleks)

When the Eleventh Doctor said the Cuculus were alien, Harry Houdini asked if they were Martians. (PROSE: Houdini and The Space Cuckoos)

Misidentified Martians
Ostensibly because of this penchant to imagine Mars as a likely source of alien life, some humans occasionally misidentified other species for Martians, just as Donna had done with the Tenth Doctor. (TV: The Runaway Bride)

Daniel Llewellyn, along with the whole world, thought that the Sycorax were from Mars until Major Blake told him that Martians looked completely different. (TV: The Christmas Invasion)

Patrick also initially thought that the Centuripede came from Mars to read other people's mail. (TV: The Last Oak Tree)

Daleks Versus the Martians
The non-DWU story Daleks Versus the Martians featured Dr. Who, Susan and Louise from the movies, Dr. Who and the Daleks and Daleks' Invasion Earth 2150 A.D., encountering a different species of native Martians to those encountered by the Doctor in the standard Doctor Who universe.