Invasions Of Earth

British Invasions

Martians in tripods invaded Britain in The War Of The Worlds.

Earth was invaded and occupied by:

the Mekon's forces from Venus in Dan Dare: Reign of the Robots;
Daleks from the extrasolar planet, Skaro, in Doctor Who;
extrasolar aliens in tripods in John Christopher's Tripods Trilogy.

Daleks, highly evolved beings moving around in protective machines, resemble Wellsian Martians and ruled Earth through roboticised men, "robomen," as the Mekon ruled it through "electrobots."

A novel, a comic strip, a TV series and a trilogy.

American Invasions

The Moon Men by Edgar Rice Burroughs
The Puppet Masters by Robert Heinlein
Invasion Of The Body Snatchers by Jack Finney
VOR by James Blish
The War Of Two Worlds by Poul Anderson (Martians and extrasolars)
Sleeping Planet by William R Burkett
Footfall by Larry Niven and Jerry Pournelle

Six novels and also a short story:

Poul Anderson cleverly projected how militarily superior humanoid aliens might conquer Earth economically in "The Soldier from the Stars." But it was another of Anderson's works, "Hunters of the Sky Cave," that prompted this line of thought about planetary invasions and occupations. See here.