We investigated interrater reliability of range of motion (ROM) measurement in the finger joints of people with Dupuytren's disease. Eight raters measured flexion and extension of the three finger joints in one affected finger of each of 13 people with different levels of severity of Dupuytren's disease, giving 104 measures of joints and motions. Reliability measures, represented by intraclass correlation coefficient (ICC), standard error of the mean (SEM), and differences between raters with the highest and lowest mean scores, were calculated. ICCs ranged from .832 to .973 depending on joint and motion. The SEM was ≤3° for all joints and motions. Differences in mean between highest and lowest raters were larger for flexion than for extension; the largest difference was in the distal interphalangeal joint. The results indicate that following these standardized guidelines, the interrater reliability of goniometer measurements is high for digital ROM in people with Dupuytren's disease.