The name Chiyoda (千代田) applies to at least three Japanese companies:
- Chiyoda Kōgaku Seikō was the former name of Minolta (from 1937 to 1962)
- Chiyoda Seisakusho, later Chiyoda Kōgaku Kōgyō, was a microscope maker which briefly produced camera lenses in 1954–5
- Chiyoda Shōkai was a distributor from 1946
- the wartime Bolca is attributed to "Chiyoda Kōgaku", which is probably none of the above
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