The purpose of this study was to explore the relationship between postural control and fundamental motor skills in girls. An observational cross-sectional study was conducted in 47 girls, aged 8-10 years. Postural control (postural sway centre of pressure) was evaluated during tandem stance, leading with dominant and non-dominant limbs with eyes open and closed, using an AMTI force platform. Fundamental motor skills were assessed using the Test of Gross Motor Development 2nd Edition, examining total, locomotor and object control scores. Data were analysed using linear regression, adjusted for body mass index percentile and household income. For locomotor skills, significant relationships were found with a number of postural sway outcomes for adjusted and unadjusted analyses (r − 0.287 to r − 0.425, p ≤ 0.042). Total motor skill score was significantly related to postural sway in the tandem dominant eyes closed condition for unadjusted and adjusted analyses (r ≥ −0.294, p ≤ 0.04). In conclusion, our findings indicate that postural control may be important for fundamental motor skill proficiency and movement quality in pre-adolescent girls, particularly for locomotor skills. Our study provides evidence supporting the clinical practice of assessing postural control in girls presenting with motor skill deficits.