The article is written in the tradition of Brent Berlin and Paul Kay's theory of basic color terms. According to this theory there is a universal inventory of eleven basic color categories from which the basic color terms of any given language are always drawn. The number of basic color terms varies from 2 to 11 and in a language having a fully developed color system there are eleven basic color terms: "white, black, red, green, yellow, blue, brown, purple, pink, orange" and "gray". The studies about basic color terms in sign languages show that lexicalization of basic color terms in sign languages follows the same pattern found in spoken languages. The current study is the first close study on the color terminology in Estonian Sign Language. The survey was carried out in summer 2005 and consisted of three tasks, following Davies and Corbett's field method: the list task, the City University color vision test and the color-naming task. Fifty ESL users from different parts of Estonia were interviewed for the study. The collected data shows that the BCT hierarchy is clearly displayed in Estonian Sign Language and it may be concluded that Estonian Sign Language is a Stage VII language and has nine basic color terms: "black, white, red, yellow, green, blue, gray, brown" and "pink/purple". (Contain 9 figures and 5 tables.)