A complete List of introduced species for even quite small areas of the world would be dauntingly long. Humans have introduced more different species to new environments than any single document can hope to record. The following list of introduced species, in other words, is hopelesly incomplete.

Australia

• Blackbird from Europe
• Rabbit from Europe
• Red Fox from Europe
• Brown Hare
• Common Starling
• Nutmeg Mannikin
• Cane Toad
• Brown Trout
• Mosquitofish
• Western honeybee
• Allamanda - Allamanda cathartica from South America
• Dromedary
• Patterson's Curse

Great Britain

Mammals

• Rabbit from continental Europe
• Fallow Deer from continental Europe
• Grey Squirrel from North America
• Mink
• Red-Necked Wallaby
• Muntjac Deer
• Feral Goat
• Sika Deer from Asia
• Chinese Water Deer
• Edible Dormouse

Birds

• Ruddy Duck from America
• Mandarin Duck from Asia
• Little Owl from mainland Europe
• Ring-necked Parakeet from Asia
• Red-legged Partridge
• Golden Pheasant from Asia
• Lady Amherst's Pheasant
• Common Pheasant
• Canada Goose

Fish

• Zander
• Wels Catfish
• Rainbow Trout
• Orfe
• Grass carp
• Bitterling

Amphibians

• American Bullfrog

Reptiles

• European pond terrapin
• Wall Lizard

Crustaceans

• Signal crayfish
• Chinese Mitten crab
• Darwins barnacle

Insects

• Pharaoh ant
• List_non-endemic_ant_species_introduced_to_the_British_Isles

Plants

• Japanese Knotweed
• Rhododendron
• Oxford Ragwort
• Hottentot fig
• Fox and Cubs
• Jewelweed
• Giant Hogweed
• Willow herb
• Evening Primrose
• Water Fern
• Autumnal Crocus
• Pigmy Weed
• Least Duckweed
• Canada Pond Weed
• Bermuda Buttercup
• Guernsey Fleabane
• Rhododendron Floating Pennywort
• Purple Dewplant
• Himalayan Balsam
• Field Speedwell
• Purple Pitcher

Hawaiian Islands

Birds

• see List of bird species introduced to the Hawaiian Islands

New Zealand

See also: Invasive species in New Zealand

Mammals

• Common Brushtail Possum from Australia
• Cat from Europe
• Deer:
  • Red Deer (Wapiti) from Europe and USA
  • Sika Deer from Asia
• Dog from Pacific islands and Europe
• Donkeys: the Ponui donkey from Europe
• Cattle from Europe
• Horse from Europe
• Hedgehog from Europe
• Ferret from Europe
• Goat from Europe
• Hare from Europe
• Himalayan thar from Himalayas
• Pig
• Rabbit from Europe
• Rats:
  • Brown rat and Black rat from Europe
  • Pacific rat (kiore) from Pacific islands
• Sheep from Europe
• Stoat from Europe
• Wallabies: Brush-tailed Rock Wallaby and others from Australia
• Weasel from Europe

Birds

• Blackbird from Europe
• Dunnock (Hedge Sparrow or Hedge Accentor) from Europe
• Magpie from Australia
• Common Myna from India
• Starling from Europe
• Common Pheasant from Asia
• Quail

Fish

• brown trout
• salmon
• catfish
• grass carp

Insects

• Monarch Butterfly from USA
• Common housefly from Europe
• Honey bee from Europe

Plants

Up to 26,000 plants have been introduced into New Zealand. This list is a few of the more common and more invasive species.

• Gorse from Scotland
• Broom
• Blackberry
• Lupin
• Ragwort
• Scotch thistle
• Californian thistle (Cirsium arvense)
• Mistflower
• Kahili Ginger (Zingiber officinale)
• Japanese honeysuckle
• Old man's beard

North America

Mammals

• Horse from Europe
• Nutria or Coypu from South America
• Nilgai from India

Birds

• Chukar from Europe
• Eurasian Collared Dove from Europe
• Eurasian Tree Sparrow from Europe
• European Starling from Europe
• Grey Partridge from Europe
• House Sparrow from Europe
• Monk Parakeet from South America
• Mute Swan from Europe
• Ring-necked Pheasant from Asia and Europe
• Rock Pigeon from Europe

Fish

• Round goby from Eurasia
• Eurasian Ruffe from Eurasia
• Common carp from Europe
• Sea lamprey, introduced into the Great Lakes through the Welland canal c.1921
• Tubenose goby from Europe

Crustaceans

• European green crab from Atlantic coasts of Europe, northern Africa, from Norway to the British Isles south to Mauritania
• Chinese mitten crab from the coastal rivers and estuaries of the Yellow Sea
• Japanese shore crab from Japan
• Spiny waterflea from northern Europe and western Russia
• Fishhook waterflea from the Ponto-Caspian region
• Mud shrimp from Europe

Mollusks

• Common periwinkle from Europe
• Chinese mystery snail from Asia
• Zebra mussel from the Caspian and Black Seas
• Veined Rapa whelk from the Sea of Japan

Insects

• Asian gypsy moth from Siberia
• Asian long-horned beetle
• Balsam woolly adelgid
• Beech scale
• Birch leafminer
• Brown spruce longhorn beetle from Europe
• European elm bark beetle
• European pine sawfly
• European pine shoot moth
• European spruce sawfly
• Gypsy moth from Europe
• Hemlock woolly adelgid from Japan
• Larch casebearer
• Larch sawfly
• Pear thrip from Europe
• Red Imported Fire Ant
• Varroa mite from Asia
• Western honeybee from Europe
• Winter moth

Plants

• Eurasian Water-milfoil from Europe, Asia and northern Africa
• Ice Plant from South Africa
• Prickly Pear from South Africa
• Eucalypts from Australia
• Hesperis matronalis -- Dame's Rocket from Eurasia
• Vicia cracca -- Cow Vetch from Eurasia
• Vicia villosa -- Hairy Vetch from Eurasia
• Lonicera japonica -- Japanese honeysuckle
• Lonicera maackii -- Amur honeysuckle
• Rosa multiflora -- Multiflora rose
• Lythrum salicaria -- Purple loosestrife
• Pueraria montana -- Kudzu (aka Pueraria lobata)
• Celastrus orbiculatus -- Oriental bittersweet
• Elaeagnus umbellata -- Autumn olive
• Alliaria petiolata -- Garlic mustard
• Hydrilla verticillata -- Hydrilla from India and Sri Lanka
• Trapa natans -- Water chestnut from Eurasia
• Eichhornia crassipes -- Water hyacinth from South America
• Pistia stratiotes -- Water lettuce from South America
• Ipomoea aquatica -- Water spinach from India and southeast Asia
• Arundo donax -- Giant reed from the Mediterranean
• Conium maculatum -- Poison hemlock from Europe
• Salvinia molesta -- Giant salvinia from Brazil
• Hedera helix -- English ivy from Europe
• Fucus serratus -- Rockweed from Europe
• Codium fragile subsp. tomentosoides -- Green sea fingers
• Centaurea Diffusa -- Diffuse knapweed