Robert Grimm (16 April 1881, in Wald – 8 March 1958) was the leading Swiss Socialist politician during the first half of the 20th century.
As a leading member of the Social Democratic Party of Switzerland he opposed the First World War.
Grimm was the main organiser of the Zimmerwald Movement and the chairman of the International Socialist Commission in Bern 1915–1917.
The demands of the strike included the 48-hour working week, old-age pensions and women suffrage.
In April 1919, a military tribunal sentenced Grimm to six months in prison for calling on soldiers to refuse orders to open fire on the strikers.