The Institute of Surveyors of Trinidad and Tobago (ISTT) was established as a non-governmental organization 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 advice on several types of nominees that enable the enactment of the Land Surveyors Act 33 of 1996 (Act).

The ISTT membership is comprised of professionals in the fields of Valuation Surveying, Quantity Surveying and Land Surveying. Land Surveying also includes the sub areas of hydrography, engineering, cadastral and land management, photogrammetry, cartography and geodesy.

The ISTT provides for the registration of Full Members, Associate Members, Student Members and Honourary Life Members who are engaged in the various levels in the profession of surveying within the Republic of Trinidad and Tobago. It also 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 institute is run by a Board of Directors, elected from its Full Members on an annual basis.