Count Baltzar Bogislaus von Platen (29 May 1766 – 6 December 1829) was a Swedish naval officer and statesman.

At age 13 Baltzar entered the Royal Swedish Navy where he served with distinction until resigning in 1800, having attained the rank of captain.

The canal, following a design by Thomas Telford, would only be completed in 1832, after von Platen's death, but during its construction, he did discover two skilled mechanical engineering brothers John Ericsson and Nils Ericson.

He was appointed Governor-general of Norway on 26 November 1827, a position which he held until his death in Christiania (modern name Oslo), the Norwegian capital, on 6 December 1829.

One of the early vessels built at Hammarsten shipyard in Norrköping was named after Baltzar von Platen in 1834.