This study was conducted to assess prevalence of Traumatic Dental Injury among primary school children in Riyadh, Kingdom of Saudi Arabia (KSA). This was a cross-sectional study based on clinical examination. It was conducted at private and public schools of Riyadh. 400 schoolchildren aged 8-11 years old were selected. Traumatic Dental Injury was recorded using epidemiologic classification adopted by (WHO) 1992 and modified by Andreasen et al. The data obtained were compiled systematically and then statistically analyzed; study revealed the prevalence of Traumatic Dental Injury (TDI) in primary schools of Riyadh was 13.6%, also showed higher prevalence in public schools than in private schools (7.3% vs 6.3%), 9 year old children had the highest prevalence of TDI (6.04%), followed by 8 years old children (5.8%). Maxilla scored higher prevalence of TDI than mandible (10.8 % vs 0.76%) and both Central & Lateral incisor teeth are the most commonly affected anterior teeth. Enamel fracture was the most common traumatic injury (48.1%). This study recorded low prevalence of TDI among primary school children, and recommended periodic oral health education programs targeting causes and methods of prevention of TDIs.