Willis Thrall (1800 - June 20, 1884) was an American businessman and map publisher based in Hartford Connecticut during the early part of the 19th century. His the son of Joel Thrall and Miriam Fitch, both of Both Bolton Connecticut. Thrall published numerous maps and also seems to have opened a tool and rule company in 1844, which he passed on to his son, Edward Thrall, as 'Will Thrall and Son'. No Thrall engravings appear after about 1836, suggesting he gave on on printing, but the tool company seems to have prospered. Thrall's most important print work was published in conjunction with D. W. Kellogg, with whom his family was associated by marriage. Thrall died in June of 1884 and is inferred at Spring Grover Cemetery, Hartford.