In TOS and to a lesser extent in TNG we saw a lot of aliens that looked completely identical to humans even though they certainly didn't come from Earth. On Star Wars and Stargate, any human-looking being is said to be a human regardless of their planet of origin. In Star Trek some of the human-like aliens are clearly identified as being humanoid rather than human but others are described more vaguely. TOS have established that there is a civilization called the Preservers that transport humans to other worlds. Also mentioned is Hodgkin's Theory of Parallel Evolution which is used to explain worlds that have managed to produce exact imitations of Earth languages and cultures. I will discuss the various human-like aliens shown and try to conclude whether they are human or humanoid:
Miri's people
Considering their planet is an exact duplicate of Earth, it's very probable that the inhabitants are human.
McCoy quote: The idea was to create a new series of diseases, a chain reaction of viruses meant essentially to extend the life of the human cell immeasurably.
Landru's people
Repeatedly identified as human.
Kirk quote: Are you suggesting the Lawgivers are mere computers, that they aren't human?
Spock quote: Quite human, Captain.
Spock quote: A computer capable of directing the lives of millions of human beings.
Eminians
Kirk quote: We're human beings with the blood of a million savage years on our hands,
Since Kirk is talking with Anan 7 at this time, the quote could be interpreted to imply that both Kirk and Anan are human. Since there's nothing in the episode that suggests otherwise, I'm going to call them human.
Capellans
McCoy quote: Capellans aren't human, Jim. They're humanoid. There's certain internal differences.
Also, in one novels, Leonard James Akaar replies "I am no more human than you are" after a Romulan mistakenly calls him human.
Klingons
The Klingons of 2nd season TOS looked identical to humans but The Trouble with Tribbles clearly demonstrates that they're not.
McCoy quote: Heartbeat is all wrong. His body temperature is. Jim, this man is a Klingon.
Argelians
Some Argelians women are empaths but that doesn't mean they're not human since Miranda Jones was human and she was a full-blown telepath. Since there's nothing in the episode that suggests otherwise, I'm going to call them human.
Iotians
Again, there's nothing to suggest they're not human so I'm saying they are.
Tyree's people
McCoy quote: Inhabitants superior in many ways to humans.
Unfortunately no one explains exactly how they are superior to humans. Nona's herbal remedies work perfectly well on Kirk considering he's from another species. Still, the above quote is pretty clear. Not human.
Ekosians
Spock quote: The Ekosians are humanoid, so there is apt to be a similarity in architecture.
Of course, humans are also humanoid so that doesn't necessarily mean much. I'm going to say they're human.
Zeons
Nazi quote: Zeon pig. On your feet, pig.
Seriously though, they seem to be be just as human as the Ekosians. I don't know how the Nazis recognize them.
Kelvans
McCoy quote: They registered as human.
Although the Kelvans were originally immense beings with hundreds of tentacles, their new bodies are human.
Yangs and Kohms
The inhabitants of Omega IV managed to come up with cultures very similar to Earth's by parallel evolution so it's probable that they were once human. They probably registered as human on the tricorder, which would explain why Captain Tracey thought their long lifespans were caused by environmental factors. However, it turned out that their long lives and immunity to disease were due to evolution so they're not human.
Romans
They speak perfect English and have a culture identical to ancient Rome's. They even have Roman names. All because of parallel evolution. If parallel evolution can duplicate Earth's cultures it can also duplicate the human genome. Definitely human.
Morgs and Eymorgs
Scott quote: Captain! There's someone, something out there in the rocks. Five of them. Humanoid, large.
Spock quote: She is an alien. The configurations of her brain are different. It could cause irreparable damage to your human brain, Doctor.
The Morgs are repeatedly called humanoids and they're much bigger than human men. Spock's quote confirms it. Not human.
Miramanee's people
Clearly identified as American Indians from the Navajo, Mohican and Delaware tribes. Transplanted by the Preservers.
Fabrini
There's nothing in the episode to suggest they're not human. The novel Ex Machina describes the Fabrini in more detail but I haven't read it yet. For now I'll consider them humans.
Platonians
Their telekinesis doesn't count because it comes from their food. However, they live for thousands years and have no immunity to disease so they can't be human.
Philana quote: I'm two thousand three hundred years old.
Scalosians
Deela quote: I hate what happens to them when they're damaged. If they are so stubborn a species, perhaps they will last longer. They all go so soon. I want to keep this one a long time.
This quote implies humans and Scalosians are different species and that Scalosians don't die from minor cellular damage like humans do and that they have much longer lifespans.
I'll continue later. Any information from the novels is welcome.
Miri's people
Considering their planet is an exact duplicate of Earth, it's very probable that the inhabitants are human.
McCoy quote: The idea was to create a new series of diseases, a chain reaction of viruses meant essentially to extend the life of the human cell immeasurably.
Landru's people
Repeatedly identified as human.
Kirk quote: Are you suggesting the Lawgivers are mere computers, that they aren't human?
Spock quote: Quite human, Captain.
Spock quote: A computer capable of directing the lives of millions of human beings.
Eminians
Kirk quote: We're human beings with the blood of a million savage years on our hands,
Since Kirk is talking with Anan 7 at this time, the quote could be interpreted to imply that both Kirk and Anan are human. Since there's nothing in the episode that suggests otherwise, I'm going to call them human.
Capellans
McCoy quote: Capellans aren't human, Jim. They're humanoid. There's certain internal differences.
Also, in one novels, Leonard James Akaar replies "I am no more human than you are" after a Romulan mistakenly calls him human.
Klingons
The Klingons of 2nd season TOS looked identical to humans but The Trouble with Tribbles clearly demonstrates that they're not.
McCoy quote: Heartbeat is all wrong. His body temperature is. Jim, this man is a Klingon.
Argelians
Some Argelians women are empaths but that doesn't mean they're not human since Miranda Jones was human and she was a full-blown telepath. Since there's nothing in the episode that suggests otherwise, I'm going to call them human.
Iotians
Again, there's nothing to suggest they're not human so I'm saying they are.
Tyree's people
McCoy quote: Inhabitants superior in many ways to humans.
Unfortunately no one explains exactly how they are superior to humans. Nona's herbal remedies work perfectly well on Kirk considering he's from another species. Still, the above quote is pretty clear. Not human.
Ekosians
Spock quote: The Ekosians are humanoid, so there is apt to be a similarity in architecture.
Of course, humans are also humanoid so that doesn't necessarily mean much. I'm going to say they're human.
Zeons
Nazi quote: Zeon pig. On your feet, pig.
Seriously though, they seem to be be just as human as the Ekosians. I don't know how the Nazis recognize them.
Kelvans
McCoy quote: They registered as human.
Although the Kelvans were originally immense beings with hundreds of tentacles, their new bodies are human.
Yangs and Kohms
The inhabitants of Omega IV managed to come up with cultures very similar to Earth's by parallel evolution so it's probable that they were once human. They probably registered as human on the tricorder, which would explain why Captain Tracey thought their long lifespans were caused by environmental factors. However, it turned out that their long lives and immunity to disease were due to evolution so they're not human.
Romans
They speak perfect English and have a culture identical to ancient Rome's. They even have Roman names. All because of parallel evolution. If parallel evolution can duplicate Earth's cultures it can also duplicate the human genome. Definitely human.
Morgs and Eymorgs
Scott quote: Captain! There's someone, something out there in the rocks. Five of them. Humanoid, large.
Spock quote: She is an alien. The configurations of her brain are different. It could cause irreparable damage to your human brain, Doctor.
The Morgs are repeatedly called humanoids and they're much bigger than human men. Spock's quote confirms it. Not human.
Miramanee's people
Clearly identified as American Indians from the Navajo, Mohican and Delaware tribes. Transplanted by the Preservers.
Fabrini
There's nothing in the episode to suggest they're not human. The novel Ex Machina describes the Fabrini in more detail but I haven't read it yet. For now I'll consider them humans.
Platonians
Their telekinesis doesn't count because it comes from their food. However, they live for thousands years and have no immunity to disease so they can't be human.
Philana quote: I'm two thousand three hundred years old.
Scalosians
Deela quote: I hate what happens to them when they're damaged. If they are so stubborn a species, perhaps they will last longer. They all go so soon. I want to keep this one a long time.
This quote implies humans and Scalosians are different species and that Scalosians don't die from minor cellular damage like humans do and that they have much longer lifespans.
I'll continue later. Any information from the novels is welcome.