Octo

Octo may refer to:
 * Octarians, a race based on octopuses.
 * DJ Octavio, the Octarian leader.
 * Octobomber
 * Octoling
 * Octotrooper
 * Shielded Octotrooper
 * Octosniper
 * Octoballs
 * Octostamp
 * Octostriker
 * Octocopter
 * Twintacle Octotrooper
 * Great Octoweapons - large mechanical robots that serve as bosses.
 * Octostomp
 * Octonozzle
 * Octowhirl
 * Octomaw


 * Octo Valley - the name of Splatoon's single-player mode.
 * Octo Valley - the location for Splatoon 2's single-player mode.
 * Octo Canyon - the name of Splatoon 2's single-player mode.
 * Octo Canyon - the location for Splatoon 2's single-player mode.
 * Octo Expansion - the name of Splatoon 2's DLC single-player mode.

Or the gear:

Or the weapons:
 * Octo Shot

Or the music:
 * [[media:Octo Valley Octoling Rendezvous.ogg|Octoling Rendezvous]] - by Turquoise October
 * [[media:Octo Valley Octoweaponry (Third Phase).ogg|Octoweaponry]] - by Turquoise October
 * [[media:Multiplayer Ink Another Day.ogg|Ink Another Day]] - by Wet Floor
 * [[media:Octo Canyon Hub.ogg|Octo Canyon]] - by Turquoise October
 * [[media:Octo Canyon Octo Eight-Step.ogg|Octo Eight-Step]] - by Turquoise October
 * [[media:Octo Canyon Octarmaments.ogg|Octarmaments]] - by Turquoise October
 * [[Media:Octo Expansion Fly Octo Fly ~ Ebb Flow (Octo).ogg|Fly Octo Fly ~ Ebb & Flow (Octo)]] - by Off the Hook
 * [[Media:Octo Expansion Splattack (Octo).ogg|Splattack! (Octo)]] - Dedf1sh

Or Octotune (Splatoon 2 Original Soundtrack)

Or the Octo Valley Missions
 * Octotrooper Hideout
 * Lair of the Octoballs
 * Rise of the Octocopters
 *  The Mighty Octostomp!
 * Octoling Invasion
 *  The Dreaded Octonozzle!
 * Octoling Assault
 *  The Rampaging Octowhirl!
 * Octosniper Ramparts
 * Octoling Uprising
 *  The Ravenous Octomaw!
 * Octoling Onslaught
 *  Enter the Octobot King!