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Maize, one of the most important cereal crops in Bangladesh, is severely contaminated by fumonisin, a carcinogenic secondary metabolite produced by <i>Fusarium</i> including <i>Fusarium proliferatum</i>. Biocontrol with <i>Bacillus</i> strains is an effective approach to controlling this <i>F. proliferatum</i> as <i>Bacillus</i> has proven antagonistic properties against this fungus. Therefore, the present study aimed to determine how native <i>Bacillus</i> strains can reduce fumonisin in maize cultivated in Bangladesh, where BDISO76MR (<i>Bacillus subtilis</i>) strains showed the highest efficacy both in vitro in detached cob and in planta under field conditions. The BDISO76MR strain could reduce the fumonisin concentration in detached cob at 98.52% over untreated control, by inhibiting the conidia germination and spore formation of <i>F</i>. <i>proliferatum</i> at 61.56% and 77.01%, respectively in vitro. On the other hand, seed treatment with formulated BDISO76MR showed higher efficacy with a reduction of 97.27% fumonisin contamination compared to the in planta cob inoculation (95.45%) over untreated control. This implies that <i>Bacillus</i>-based formulation might be a potential approach in mitigating fumonisin contamination in maize to ensure safe food and feed.