The Institute of Surveyors of Trinidad and Tobago (ISTT) was established as a non-governmental organisation in 1996 upon the amalgamation of the Land Surveyors Association of Trinidad and Tobago (1948), Quantity Surveyor's Society of Trinidad and Tobago (1963) and ProVal (the Association of the Valuation Surveyors) (1975). The Institute plays a pivotal role in providing the Minister with responsibility for Lands and Land Surveying with advice on several types of nominees that enable the enactment of the Land Surveyors Act 33 of 1996 (Act) and serves as the main stakeholder representing local surveying professionals and provides training, dissemination of information to the public and advice to both surveyors and the public.

The ISTT membership is comprised of Full and Associate Members who are professionals in the fields of Valuation Surveying, Quantity Surveying and Land Surveying within the Republic of Trinidad and Tobago. Land Surveying also includes the sub areas of hydrography, engineering, cadastral and land management, photogrammetry, cartography and geodesy. The Institute also provides for the registration of Student Members which recognises any person actively pursuing a course of study leading to an academic qualification acceptable by the ISTT and Honourary Life Members, a recognition of any person who is no longer actively involved in the practice of professional surveying but has made a valuable contribution to the profession and the Institute.

The Institute is led by a Board of Directors, elected from its Full Members on an annual basis.