William Leadbetter Calderwood FRSE (1865–1950) was a Scottish marine biologist.
He served as Director of the Marine Biological Association Laboratory in Plymouth.
[1] He was born in Glasgow the son of Rev Henry Calderwood and Anne Hulton Leadbetter.
His early childhood was spent in the family home at 197 St. Vincent Street in Central Glasgow.
In 1943 he was appointed by the Scottish Hydro-Electric Board as their principal advisor on fishery issues.