GTTA is an abbreviation for the former legal names of the following transportation agencies in the Greater Toronto Area of Ontario, Canada:

• Greater Toronto Transportation Authority - the former legal name of Metrolinx, the Ontario provincial agency responsible for transportation planning in the Greater Toronto Area and Hamilton
• Greater Toronto Transit Authority - the former legal name of GO Transit, now a branch of Metrolinx.

• Elaida a'Roihan
• Elaida do Avriny a'Rohain
• Elaida do Avriny a'Roihan
• Elaida Sedai
• Elain
• El-Ain
• Elaine
• Elaine and Melanie Silver
• Elaine, AR
• Elaine, Arkansas
• Elaine (Arthurian legend)
• Elaine Barrie
• Elaine Benes
• Elaine Brown
• Elaine Carbines
• Elaine Chao
• Elaine C. Smith
• Elaine Cunningham
• Elaine de Kooning
• Elaine Douvas
• Elaine Dundy
• Elaine Edwards
• Elaine Fleming
• Elaine F. Marshall
• Elaine Hendrix