The aim of this study was to analyze the potential of Buton forest onion extract (BFOE) Eleutherine bulbosa (Mill.) Urb. as a prebiotic and an antioxidant. Buton forest onion was extracted using 96% ethanol by maceration method. The prebiotic content of BFOE was determined using high performance liquid chromatography (HPLC). The ability of BFOE as a prebiotic was analyzed the growth of Pseudoalteromonas piscicida 1Ub and Bacillus sp. NP5.and its resistance to artificial gastric acid and α-amylase. Antioxidant activities were determined using 2,2-diphenyl-1-picrylhidrazyl (DPPH). Results indicate that the content of the oligosaccharides of BFOE including inulins, fructooligosaccharides (FOS), galactooligosaccharides (GOS), and raffinoses was 2.1%, 10%, 1% and 7.5%, respectively. The mixed oligosaccharides were found capable to stimulate the growth of P. piscicida 1Ub and Bacillus sp. NP5. The optimum BFOE concentration to stimulate the growth of probiotics was 1.25 mg/mL (0.17 ± 0.02 and 0.21 ± 0.00). The mixed oligosaccharides were also resistant to hydrolysis of artificial gastrice acid and α-amylase, with maximum hydrolysis percentages of 8.25 ± 0.25% and 27.52 ± 1.68%, respectively. The BFOE was capable to DPPH radical scavenge with IC50 of 1.48 µg/mL. The BFOE of this study has the potential to be a prebiotic and an antioxidant.