© 2018, Springer-Verlag Italia S.r.l., part of Springer Nature. Background: Fundamental movement skills (FMS) are basic observable patterns of movement and prerequisites to successful performance of sports specific skills. International research has found that children are not reaching their FMS developmental potential. Stability is a third construct of FMS; however, it is typically excluded from FMS assessment protocols. Limited research has examined FMS and balance proficiency in Irish children. Aims: This study aimed to examine FMS and balance proficiency in juvenile Gaelic games players. Methods: Thirteen FMS skills and dynamic balance were measured on 63 juvenile Gaelic games players (9.9 ± 1.3 years) using the Test of Gross Motor Development-3 and the Y Balance Test (YBT), respectively. Results: Children demonstrated high levels of mastery in the run (100%), slide (96.8%), underhand throw (95.2%), catch (93.7%), and overhand throw (93.7%). Boys performed significantly better in object control skills (p < 0.0001) and total FMS skills (p = 0.002) than girls. Boys also participated in Gaelic games more frequently (p = 0.005), for more hours per week (p = 0.012) and for more years (p = 0.001). Players that played more hours of Gaelic games per week performed significantly better in object control skills (p = 0.04). Boys and girls did not perform significantly different in the YBT. Conclusions: Irish juvenile Gaelic game players display higher FMS mastery in a range of FMS and balance proficiency than age-matched, general population. This suggests that participation in Gaelic games facilitates FMS development in children. However, low mastery levels were observed in certain skills; therefore, coaches should incorporate FMS development in coaching sessions.