The 15 Biggest Spaceships In Fiction 

QUESTION just out of curiosity where does the babylon 5 come in all of these?

You missed The Moon, Halo ring (the smaller version of Ring World), Disc World, and Dyson Spheres, along with the galaxy spanning TransWarp Tunnel Network, and the multiple galaxy spanning Stargate Network.

What about the Star Trek Dyson Sphere? Over 200 million kilometres in diameter.

First 3 have never appeared in any movies so I think the title is a bit misleading.

"Gurren Lagann: The Lights in the Sky are Stars" is a movie. The Harvester Mothership doesn't even make this list. The top 14 items on the list would all be from "Gurren Lagann: The Lights in the Sky are Stars", the remaining item would depend on what you want to count... the 2 light-year diameter energy cloud surrounding V'ger in Star Trek the motion picture is the next item on my list; if you don't want to count the cloud, then Unicron in "The Transformer's: the Movie" from 1986 would be next if you scale him to the planet Cybertron and use the size for Cybertron stated in the first issue of the Marvel Comics Transformers comic; Unicron would still be next if you scale him from the Michael Bay movies, if you don't like the Saturn sized Cybertron. If you don't count Michael Bay movies because they suck (a camp I am in), Unicron still scales slightly larger than the Harvester Mothership, based on calculations of Cybertron's size based on images from the episodes "Megatron's Master Plan" which would be cannon to "The Transformer's: The Movie". If your more open to using TV referenced material or material from any source since half the entries were from Star Wars expanded universe, the list after the V'ger cloud would be the Niven Ring, the Dyson Shell from "Star Trek: The Next Generation", the Orbital from The Culture series, the Magog Worldship from "Gene Rogenberry's: Andromeda", Unicron, the Forerunners Installation OO from the Halo series, Cybertron, A'Tuin the Discworld (which by the way appeared in several Discworld movies), Mogo the Green Lantern (which appeared briefly in the "Green Lantern" movie), Starkiller Base if you use actual physics, the Forerunners Halo, Unicron and Cybertron (using other size measures).

What about the Haloes?

The eclipse class SSD and Vengeance class SSD only appeared in star wars legends and half of these "ships aren't ships this video is a bit miss leading.

I. HATE. COMPUTER. VOICES.