- This article is about the year. For the set, see 1973 Emirates Airliner.
- 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