Ascaris lumbricoides is considered as the largest intestinal nematode which infects man. It has the highest prevalence in area where sanitation level is low. A total of 159 Orang Asli (aborigine) school children from Kuala Kubu Bharu, Selangor participated in this study. The faecal specimens were collected and examined for A. lumbricoides ova using direct faecal smear and formalin-ether concentration techniques. The prevalence of ascariasis among the aboriginal school children in Kuala Kubu Bharu was 38.4%. With regards to the gender wise, the prevalence of infection was higher in males (44.9%) compared to females (33.3%). School children aged 9 years old showed the highest infection rate at 68.4%. From this study, it was found that the infection rate among the Orang Asli school children in Kuala Kubu Bharu was high despite they lived in a semi urban area with a better sanitation as compared to those living in the deep rural area.