Scotland Yard seized a record £73 million from convicted criminals last year, including nearly £1m in cash found in a black cab.
The Met said the total was the largest confiscated in London in a single year since the Proceeds of Crime Act came into force in 2002.
The largest single cash seizure came when officers stopped a taxi in east London and found a black holdall in the passenger section containing £943,000 in notes.
Detectives believe the cash was being moved around London by a criminal network.
In another case police issued a £6,328,119 confiscation order after two men were convicted for a money laundering operation linked to brothels across London.