The Negro Motorist Green Book (also, The Negro Travelers' Green Book, or Green-Book) was a guidebook for African American roadtrippers. It was founded by Victor Hugo Green, an African American, New York City postal worker who published it annually from 1936 to 1966. This was during the era of Jim Crow laws, when open and often legally prescribed discrimination against African Americans especially and other non-whites was widespread. While pervasive racial discrimination and poverty limited black car ownership, the emerging African American middle class bought automobiles as soon as they could but faced a variety of dangers and inconveniences along the road, from refusal of food and lodging to arbitrary arrest. In the South, these dangers were particularly severe, where Black motorists risked harassment, physical violence, or even murder for minor infractions or for being in predominantly white areas. In some cases, African American travelers who got lost or sought lodging off the beaten path were killed, with little to no investigation by local authorities. In response, Green wrote his guide to services and places relatively friendly to African Americans. Eventually, he also founded a travel agency.
African American travelers faced discrimination, such as white-owned businesses refusing to serve them or repair their vehicles, being refused accommodation or food by white-owned hotels, and threats of physical violence and forcible expulsion from whites-only "sundown towns". Green founded and published the Green Book to avoid such problems, compiling resources "to give the Negro traveler information that will keep him from running into difficulties, embarrassments and to make his trip more enjoyable". The maker of a 2019 documentary film about the book offered this summary: "Everyone I was interviewing talked about the community that the Green Book created: a kind of parallel universe that was created by the book and this kind of secret road map that the Green Book outlined".