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There has been significant progress in the biological synthesis of nanomaterials. However, the molecular mechanism of synthesis of such bio‐nanomaterials remains largely unknown. Here, we report the extracellular synthesis of crystalline silver nanoparticles (AgNPs) by using Morganella sp., and show molecular evidence of silver resistance by elucidating the synthesis mechanism. The AgNPs were 20±5 nm in diameter and were highly stable at room temperature. The kinetics of AgNPs formation was investigated. Detectable particles were formed after an hour of reaction, and their production remained exponential up to 18 h, and saturated at 24 h. Morganella sp. was found to be highly resistant to silver cations and was able to grow in the presence of more than 0.5 mM AgNO₃. Three gene homologues viz. silE, silP and silS were identified in silver‐resistant Morganella sp. The homologue of silE from Morganella …