ABSTRACT Radiographic pelvimetry is the measurement of pelvic diameters by radiographs. The results allow us to determine the pelvimetric pattern of a species, generating data for prophylactic methods against parturition complications and providing pelvis' anatomical classification. There is a lack of such data on wild animals. Callithrix penicillata and C. jacchus are two marmoset species introduced in Southeast Brazil, mainly by anthropic action, successfully adapted and hybridized. This study aimed to perform pelvic measurements through radiographic pelvimetry in hybrid marmosets (Callithrix penicillata × Callithrix jacchus) from different locations in the Rio de Janeiro state, Brazil. The radiographs were performed in the Veterinary Radiology Department of the Veterinary Hospital of UENF, undergoing measurements through the "Image J" program of upper (UBD), lower (LBD), middle (MBD) bi-iliac diameters, right (RDD), and left (LDD) diagonal diameter, sacropubic diameter (SPD), and pelvic inlet area (PIA). Analysis of variance was performed with different origin locations and sex of the specimens, and means were compared through the SNK Test at 5% probability. Pelvic diameters of females were significantly larger than males, with sexual dimorphism. The pelvis was classified as dolichopelvic. The obtained data can be pelvic reference values for these animals.