1973

== Events ==
* June 11: LEGO Systems, Inc. is established in Brookfield, Connecticut. 
* The modern LEGO logo begins to appear on all products.
* The first LEGO products are sold in Hungary.
* LEGO Portugal is established.
*LEGOLAND Sierksdorf was opened.
== Themes introduced or discontinued ==
* Universal Building Sets were introduced.
== Sets introduced ==
* 010 Pre-School Set
* 020 Building Set
* 091 Playbox for 2 Children
* 092 Playbox for 4 Children
* 093 Playbox for 6 Children
* 094 Kindergarten Assortment for Children to 3 years
* 095 Kindergarten Assortment for Children to 5 years
* 096 Playgroup box
* 1 Basic Set
* 2 Basic Set
* 3 Basic Set
* 4 Basic Set
* 5 Basic Set
* 6 Basic Set
* 7 Basic Set
* 7 Educational Box - Empty
* 8 Basic Set
* 8 Universal Building Set
* 11 Small Pre-School Basic Set
* 12 Medium Pre-School Basic Set
* 13 Large Pre-School Basic Set
* 14 Small House Set
* 15 Large House Set
* 16 City Square Set
* 17 Airport Set
* 30 Small Ship Set
* 31 Medium Ship Set
* 32 Large Ship Set
* 78 Basic Set
* 90 Super Set
* 91 Therapy I with buildingbox 2-5 years
* 92 Therapy II with buildingbox 5-7 years	
* 93 Therapy III with buildingbox 7- years
* 94 Therapy I without buildingbox 2-5 years
* 95 Therapy II without buildingbox 5-7 years
* 96 Therapy III without buildingbox 7- years
* 101 Imagination Beginner Set 1
* 102 Imagination Basic Set 2
* 104 Imagination Deluxe Set 4
* 105 Imagination Master Set 5
* 112 Giant Base Plate
* 115 Building Set
* 135 Building Set
* 145 Building Set
* 221 Idea Book #1
* 262 Complete Children's Room Set
* 269 Kitchen
* 270 Grandfather Clock, Chair and Table
* 271 Baby's Cot and Cabinet
* 272 Dressing Table with Mirror
* 273 Bureau
* 290 Dining suite
* 291 Blackboard and School Desk
* 292 Kitchen Sink and Cupboards
* 293 Piano
* 310 Tug
* 311 Ferry	
* 312 Cargo Ship
* 356 Swiss Villa
* 357 Fire Station
* 358 Rocket Base
* 381 Lorry and Fork Lift Truck
* 382 Breakdown Truck and Car
* 383 Truck with Excavator
* 384 London Bus
* 410 Payloader
* 420 Police Car
* 450 Fork Lift
* 460 Rescue Units
* 507 DUPLO Kindergarten Set
* 508 DUPLO Kindergarten Set
* 515 Building Set
* 540 Swiss Villa
* 545 Conveyor Station
* 560 Police Heliport
* 570 Fire House
* 610 Vintage Car
* 611 Police Car
* 653 Ambulance and Helicopter
* 654 Crane Lorry
* 655 Mobile Hydraulic Joist
* 686 Tipper Trucks and Loader
* 687 Caravelle Plane
* 688 Shell Tank Truck
* 710 Wrecker with Car
* 730 Steam Shovel with Carrier
* 785 red box
* 791 red storage box
* 793 storage box
* 794 storage box
* 940 flags, signs and trees
* 996 wire with banana plug
Category:Years
Category:1973
Category:Unfinished