The objective was to assess the psychometric properties of a French-Canadian version of the third edition of the Test of Gross Motor Development (TGMD-3). Participants were 127 French-speaking Canadian children. Results supported the validity-reliability of a bifactor exploratory structural equation modeling representation of the TGMD-3. Additionally, results supported a lack of differential item functioning as a function of age, body mass index (BMI), physical activity/sport practice (PA/SP), and sex. Finally, latent mean differences showed that: (a) older children score lower on specific skills and higher on the global motor skills factor than younger children; (b) children with a higher BMI score lower on locomotor skills than children with a lower BMI; (c) children with higher weekly frequency of PA/SP score higher on the global motor skills factor than children with a lower weekly frequency of PA/SP; and (d) boys score higher on ball skills and lower locomotor skills than girls.