Soil-transmitted helminths (STHs) and schistosomes are the major public health problems in thernvast majority of developing countries including Ethiopia. Both helminthic groups are known tornsignificantly contribute to anaemia. This study was aimed to assess the effect of intestinalrnhelminth infections and deworming to anaemia among school children. A cross-sectional studyrnwas carried out and 403 school children were selected using systematic random samplingrntechnique from Tikur Wuha Elementary School, Jiga, Northwestern Ethiopia from February -rnMarch, 2011. Stool samples were processed for microscopic examinations using double Kato-rnKatz and average fecal egg counts were used. Hemoglobin was determined using Hemocue HBrn201 analyzer. Data was analyzed using the statistical package for social science (SPSS). Thernoverall prevalence of STHs and schistosome infections among the school children was 58. 31%.rnSingle, double, triple and quadruple infections were 41.19%, 15.38%, 1.49 and 0.25%,rnrespectively. The prevalence of hookworm, Schistosoma mansoni, Ascaris lumbricoides,rnTrichuris trichiura, Enterobius vermicularis, and Hymenolepis nana infections were 46.90%,rn24.57%, 4.22%, 1.74%, 0.5% and 1.24%, respectively. The current study showed that intestinalrnhelminth infections particularly hookworm and S. mansoni were positively associated withrnanaemia (P < 0.05). The overall pre-treatment prevalence of anaemia was 14.64%, whilernanaemia associated with intestinal helminth infections was found to be 11.91%. Afterrndeworming, there was a rise in the mean hemoglobin of school children from 12.73Â±1.18rnpretreatment level to 13.96Â±1.21 g/dl post-treatment level (P= 0.000). The result revealed thatrnfollowing deworming, prevalence of both intestinal helminth infections and anaemia associatedrnwith intestinal helminth infections were reduced from 58.31% to 12.41% and 11.91% to 8.44%,rnrespectively. The present study showed that deworming as part of helminth control decreasesrnintestinal helminth infections and improves hemoglobin concentration among school children.rnDeworming program should be included as a strategy for the control of anaemia in schoolrnchildren where there is high prevalence of intestinal helminth infections.rnKey words/ phrases: Anaemia, deworming, school children, STHs, schistosomiasis