Carl Nicolai Stoud Platou (26 June 1809 – 11 September 1888) was a Norwegian civil servant and politician.
He was born in Christiania as a son of educator, professor, politician and State Secretary Ludvig Stoud Platou (1749–1815) and his wife Karen Lumholtz (1785–1833).
He was hired as a clerk in the Norwegian Ministry of Justice in 1833, the same year his father died.
He was a board member of Bergen Museum from 1850 to 1853 and then from 1864, became a board member of Det Nyttige Selskab from 1871 (praeses from 1875 to 1876), helped found Bergen Public Library in 1872 and chaired the local railway committee from 1874.
He was honored locally with a bust in the city hall in 1885, and a street at Nygårdshøyden being named for him in 1891.