The Greater Toronto Transportation Conference (GTTC) is an organization of senior people involved in planning, design or provision of transportation infrastructure or services in the Greater Toronto Area (GTA).

Originally formed as the Joint Traffic Committee in 1926, and later known as the Metro Toronto Transportation Conference, the GTTC is a unique forum for dialogue relating to all aspects of transportation policy, planning, operation and service provision across the GTA.

Membership in the GTTC is open to senior individuals in public or private sector transportation related organizations. The GTTC meets eight times a year on a Friday over lunch (usually the 4th Friday of the month). Lunch time discussions of the most topical transportation issues in the GTA are always lively, informative, frank and collegial.