003 may refer to:
Regional Pokédex number
- #003 Venusaur, in the Kanto and National Pokédexes
- #003 Meganium, in the New Pokédex and the Johto Pokédex
- #003 Sceptile, in the Hoenn Pokédex in Generation III and Hoenn Pokédex in Generation VI
- #003 Torterra, in the Sinnoh Pokédex
- #003 Serperior, in the Unova Pokédex and New Unova Pokédex
- #003 Chesnaught, in the Central Kalos Pokédex
- #003 Mienfoo, in the Coastal Kalos Pokédex
- #003 Trapinch, in the Mountain Kalos Pokédex
- #003 Decidueye, in the Alola Pokédex in Sun and Moon and the Alola Pokédex in Ultra Sun and Ultra Moon
- Nidoran♂, a Pokémon who in Generation I has the index number of 003
- Venusaur, a Pokémon who in Generation II and onward has the index number of 003
- The Great Ball, a Poké Ball which in Generation I and from Generation III and onward has the index number of 003
- The BrightPowder, a held item which in Generation II has the index number of 003
- The index number for the move DoubleSlap
- Main series:
- Ash Catches a Pokémon, episode 3 of the original series
- There's no Place Like Hoenn, episode 3 of the Advanced Generation series
- When Pokémon Worlds Collide!, episode 3 of the Diamond & Pearl series
- A Sandile Gusher of Change!, episode 3 of the Best Wishes series
- A Battle of Aerial Mobility!, episode 3 of the XY series
- Loading the Dex!, episode 3 of the Sun & Moon series
- Spell of the Unown: Entei, the third full-length Pokémon movie
- Kanga Games, the third Pikachu short animation
- Other anime series:
- Route 3, a route in Kanto
- Route 3, a route in Unova
- Route 3, a route in Kalos
- Route 3, a route in Alola
- The island named Three Island
- The town named Three Island
- A port located on Three Island
- A path located on Three Island
- TM03, a Technical Machine
- HM03, a Hidden Machine
- Pecha Berry, a Berry that debuted in Generation III
- Legendary trios, sets of three legendary Pokémon and their masters
- Secret Storage 3, a location in Pokémon Trozei!
- Huge Storage 3, a location in Pokémon Trozei!
- Phobos Mobile No.3: Phobos Drill, a location in Pokémon Trozei!
- SOL Laboratory 3, a location in Pokémon Trozei!
- The Sinis Trio, a set of three highly ranked members of Team Dim Sun in Pokémon Ranger: Shadows of Almia.
- The Secret of Kangaskhan, round 3 in the Red, Green & Blue chapter of Pokémon Adventures
- The Mystery Boy, Jun!!, chapter 3 in Pokémon Diamond and Pearl Adventure!
- The Tale of Hareta and Shaymin, the third special chapter in Pokémon Diamond and Pearl Adventure!
- Goodbye to a Peaceful Village!, chapter 3 in Pokémon Mystery Dungeon: Ginji's Rescue Team
- Clefairy Tale, chapter 3 of The Electric Tale of Pikachu
- Treasure Hunting?! Try The Maze!, chapter 3 of Ash & Pikachu
- Hanada City, chapter 3 of Pokémon Zensho
- The Legendary Pokémon Appears!, chapter 3 of Pokémon Gold & Silver: The Golden Boys
- The Newborn Grimer, chapter 3 of How I Became a Pokémon Card
- Brothers Face Off "Familiar Rivals", chapter 3 of Aim to Be a Card Master!!
- Challenge From a Rival, chapter 3 of Phantom Thief Pokémon 7
- Take Out The Rival Onix!!, chapter 3 of Pokémon Pocket Monsters
- Something Happened!! Let's Go After Pikachu!!, chapter 3 of Pokémon Ruby-Sapphire
- Battle Between Student and Master!, chapter 3 of Pokémon Battle Frontier
- Oh, that Cute, Cute Jigglypuff!, chapter 3 of Magical Pokémon Journey
- Enter the Idiot Treecko (chamo!), chapter 3 of Pokémon Chamo-Chamo ☆ Pretty ♪
- Pokémon Get Match!!, chapter 3 of Pokémon Gotta Catch 'Em All
- The Ultimate Combination is Formed!!, chapter 3 of Pocket Monsters Platinum: Aim to Be Battle King!!
- The Team Rocket Elite Trio, a set of three highly ranked members of the first incarnation of Team Rocket from Pokémon Adventures
- The Three Fires, a set of three highly ranked members of Team Magma from Pokémon Adventures
- The Subleaders of the Sea Scheme, a set of three highly ranked members of Team Aqua from Pokémon Adventures
- The Three Beasts, a set of three highly ranked members of the second incarnation of Team Rocket from Pokémon Adventures