Baron Louis Gerard De Geer af Finspång (18 July 1818 – 24 September 1896) was a Swedish statesman, lawyer and writer.

De Geer's greatest political achievement was the reform of the Swedish representative system.

He served until April 1880, when the failure of his repeated efforts to settle the armaments issue again induced him to resign.

Some argue that it was De Geer who laid the foundations for the strong economic growth in Sweden from 1870 to 1970.

For example, his explanation of why he, at such a young age, was appointed Prime Minister of Justice, was that in the narrow circles of Swedish nobility at the time, it was difficult to find anyone with at least the mediocre intelligence which was needed for the office.