Indonesian Journal of Oil Palm Research Volume 29 Number 3 Year 2021 is published by presenting articles: Effect of Coumatetralyl and Sarcocystis Singaporensis Application on RAT Attack in Oil Palm Plantation, Production and Characterization of Microcrystalline Cellulose from Oil Palm Trunk Waste (Elaeis guineensis Jacq.) from Plantation Replanting, Preference Study of Merck in Palm Oil Mill using Analytical Hierarcy Process, Preliminary Study of Vitamin E Content in IOPRI'S Oil Palm Varieties, and Characteristic Observation of Cordyceps Militaris (L) Wild Type Strain from Five Oil Palm Plantation in Muara Wahau East Borneo.