Lauchlan Bellingham Mackinnon (1814 - 10 Jul 1877) was the Member of Parliament for Rye, Sussex, England from 1865 to 1868.
He was the second son of William Alexander Mackinnon. He served with some distinction as a captain in the Royal Navy and wrote three books about his experiences: Atlantic and transatlantic: sketches afloat and ashore, Steam Warfare in the Parana and Some Account of the Falkland Islands. From a Six Months' Residence in 1838 and 1839. When his father retired from parliament in 1865 he stood for the seat in Rye as a liberal but only served one term and never spoke in Parliament.