T1A

T1A may refer to:

Places

 * Line T1a (Oslo Metro), Oslo, Norway
 * T1A (postal code); see List of postal codes of Canada: T

Products

 * BAe Hawk T1A, jet trainer
 * Eurofighter Typhoon T1A, jet fighter; see Eurofighter Typhoon variants

Other uses

 * iodothyronamine (T1a), a thyroid hormone