Crosbycus is a potentially monotypic genus of harvestmen in the family Taracidae, with one species (Crosbycus dasycnemus) found in North America as of 2023, per the World Catalog of Opiliones.

[1][2][3][4] The genus Crosbycus is named after the arachnologist Cyrus Richard Crosby (1879–1937).

[5] C. goodnighti Roewer, 1951 was indicated as species inquirenda by Cokendolpher & Lee 1993, and arguably "should be deleted from North American faunal lists" (per Shear, 2008).

[6] For other species from Eurasia, the affinies are even less certain, notably C. pentelicus was considered a junior subjective synonym of Nemastoma thessalum Simon, 1885 by Rambla (1968).

Another, C. speluncarum Roewer, 1951, might be best considered nomen dubium (after Schönhofer 2013).