Protecting and re-establishing forests for their economic and ecosystem services including asrncarbon stocks is one of the four pillars of the climate resilient green economy (CRGE) strategy ofrnEthiopia. The development of tree allometric equations is crucial for accurate forest biomassrnand carbon assessment. However, very few allometric equations have been developed inrnEthiopia and as a result generalized allometric equations, often established for forests in otherrnstudy areas, are used by default. The overall objective of this study was to develop speciesrnspecific allometric equation for four indigenous trees namely Bersama abyssinica, Cupressusrnlusitanica, Maytenus arbutifolia, and Rhamnus staddo in Egdu forest, Oromia region. Treesrnwere marked and climbed, for measurement of estimator variables and two branches per treernwere removed for further measurement and for the development of allometric models based onrnFAO manual. A set of species specific models relating aboveground biomass to variables suchrnas diameter at breast height, wood specific gravity and tree height were fitted to the data byrnregression analysis with step-wise increase in the independent variables using R-statisticalrnsoftware. The total dry aboveground biomass of the sampled trees in the study site was 80.20,rn3874.23, 171.28, and 84.45 kg for Bersama abyssinica, Cupressus lusitanica, Maytenusrnarbutifolia, and Rhamnus staddo respectively. The best models were selected using informationrncriterion and model confidence intervals are also provided. Model-14,rnAGB=9.996+0.518(DBH)-0.044(H)-17.37(Ï) was the best performing model for Bersamarnabyssinica, having R2=0.7273, adjusted R2=0.7777 and p-value of 0.001568. For Cupressusrnlusitanica, model-13, AGB=-193.359+25.869(DBH)-15.727(H)+90.952(Ï), with R2=0.9500,rnadjusted R2=0.9312, and p-value of 1.509x10-05. Similarly, for Maytenus arbutifolia, model-15,rnAGB=5.538+1.9545(DBH)+0.316(H) 8.01(Ï), with R2=0.9421, adjusted R2=0.9204 and p-valuernof 2.706x10-05 and for Rhamnus staddo, model-12, AGB=-2.25+3.220(DBH)-1.356(H) was thernbest model with R2=0.9253, adjusted R2=0.8954 and p-value of 0.001526. Diameter at breastrnheight, wood specific gravity, and tree height were important estimator to consider for thernestimation of aboveground biomass at tree scale. Comparison of these results with thosernobtained using generalized allometric model revealed differences with biomass estimation. Thernapplication of the newly proposed allometric models from this study shall be based on thernavailability of forest inventory data for incorporation of the various estimator variables.rnKeywords: Allometric model, Biomass, species specific, Egdu forest, semi-destructive method