Background: Almost everywhere in the world, childhood obesity is becoming a serious public health problem with negative effects on both children’s health and society as a whole. The main objective of this study was to determine whether obesity has an effect on the severity of supracondylar humerus fracture in children, regardless of whether it is a low- or high-energy trauma. Methods: The electronic records of patients treated for the supracondylar fracture of the humerus in the ten-year period from 1 January 2013 to 1 January 2023 were reviewed retrospectively. Results: In the observed period, 618 children, including 365 (59.06%) boys and 253 (40.94%) girls, were hospitalized and treated surgically with the diagnosis of supracondylar fracture. The distributions according to the observed parameters were as follows: age (months) = 88.18 ± 32.64; height (cm) = 123.42 ± 16.83; weight (kg) = 27.18 ± 11.32; body mass index = 17.18 ± 3.06; body mass index-for-age percentile = 57.34 ± 32.11. Overall, 141 (22.82%) fractures were classified as Gartland II, while 477 (77.18%) were classified as Gartland III. A total of 66 (10.68%) fractures were flexion type, while 552 (89.32%) were extension type. The left elbow was affected in 401 (64.89%) children, while the right was affected in 217 (35.11%) children. The main mechanism of injury was a fall at ground level (33.33%). In relation to gender, a statistically significant difference was recorded in body mass index and percentile (p< 0.05). According to Gartland, the proportion of children below and above the 85th percentile in relation to the type of injury was statistically significant (p< 0.05). It was determined that the energy level does not significantly influence the injury’s severity:p(GII) = 0.225;p(GIII) = 0.180. Conclusions: In our study, we found that the proportion of overweight and obese children requiring surgical treatment was higher in Gartland type III injury, so there is no doubt that as a society we must prevent further increases in the prevalence of childhood obesity for this reason as well.