The Ernemann Bob I is an early roll-film folding camera produced by the Dresden maker Ernemann in the early twentieth century. It sat at the entry level of Ernemann's Bob series of folding cameras aimed at general amateur use.

Public sales data for the Bob I is extremely thin: the only recorded UK auction hammer result on file is £115 from 2004, so any view of what one is worth today is provisional rather than firm. As of 2026 a clean, working example would most likely sell for a broadly similar two-figure to low three-figure sum at saleroom level, but with a single data point the true price range cannot be reliably stated.