This is a list of all the motorized tricycle and quadricyclecycle manufacturers. Historical and current vehicles included.
Names in bold type have web sites. The rest are Wikipedia articles.

A
B
C
D
E
F
G
H
I
J
K
L
M
O
  • Opelit Mopetta

P
  • Peel Manxcar
  • Peel P50
  • Peel Trident
  • Persu Hybrid
  • Piaggio Ape
  • Piaggio MP3
R
  • Reliant Regal
  • Reliant Robin

S
  • Scammell Scarab
  • Scootacar
  • Scott Sociable
  • Shelter (automobile)
  • Sinclair C5
  • Spira (car)
  • Steam tricycle
  • Styl Kar

T
  • Tourette (automobile)
  • Tri-Magnum
  • Triac (car)
  • Triking
  • Twentieth Century Motor Car Corporation
  • Twike

V
  • Velorex

X
  • XR-3 Hybrid
  • Xtra (automobile)

Z
  • ZAP Xebra
  • Zoe Mo
  •