Kepok banana peel (Musa x paradisiaca L.) contains flavonoids that act as antioxidants. The antioxidant activity of the ethanol extract of Kepok banana peel can be used as an active ingredient of nano gel. Nano-sized preparations can increase the efficiency of the delivery of active ingredients with lesser side effects and also decrease the stratum corneum to make it easier to penetrate. The objectives of this study were to determine whether the ethanol extract of Kepok banana peel (Musa x

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... isiaca L.) can be formulated as nano gel and to measure its antioxidant activity. The method of nano gel preparation was stirring technique by using a magnetic stirrer and a sonicator. The antioxidant activity was measured using DPPH method. The results showed that the ethanol extract of kepok banana peel could be formulated as nano gel with size F0 = 161.9 nm; F1 = 171.3 nm; F2 = 165.6 nm; F3 = 163.9 nm which fulfilled the nano gel size requirement (20-200 nm) and the potential zeta value F0 = -43.4 mV; F1 = -43.7 mV; F2 = -46.9 mV; F3 = -47.0 mV fulfilled the requirements (smaller than -30 mV and greater than +30 mV). The antioxidant activity showed that the IC50 of ethanol extract of was stronger than IC50 of 1% nano gel (198.0279 µg/ml : 282.8933 µg/ml).