Cerbera odollam Gaertn. activated carbon was derived from mangrove plant which is poisonous and planted as shade tree. The morphology of Cerbera odollam Gaertn. fruit is similar with coconut shell and the contains of lignin and cellulose is higher than coconut. Cerbera odollam Gaertn. fruit was dried, cut and carbonized at 300 oC, 400 oC and 500oC. Then Cerbera odollam Gaertn. carbon was activated by physical steam activation and chemical activation, using H3PO4 (5% & 10%) and KOH (5% & 10%), at activation temperature 650oC and activation time 60 and 90 minutes. Proksimat analysis of Cerbera odollam Gaertn. carbon was carried out to determine moisture, volatile content, fly ash, fix carbon, ash content and iod adsorption, total chromium by using AAS. The result showed that activated carbon derived from Cerbera odollam Gaertn. fruit which was activated by KOH 5% at 60 minutes improved the chromium adsorption for about 99.474%.