Rickard Johannes Sandler (29 January 1884 – 12 November 1964) was a Swedish Social Democratic politician.

After receiving a Bachelor of Arts degree from Uppsala University, Rickard Sandler became a teacher at a folk high school in Kramfors (where his father was headmaster) and another in Brunnsvik.

In 1921 when Thorsson went on to start the new Ministry of Commerce and Industry, Sandler took his place as the minister of finance, a capacity he held until 1923.

As Prime Minister, Sandler had to deal with the issue of reducing the Swedish military, as had been promised during the election campaign.

Sandler wanted Sweden to actively help Finland after the Soviet Union had attacked it on 30 November 1939, a stance the prime minister did not hold.

Sandler translated Das Kapital by Karl Marx into Swedish, and in 1943 he authored a book on literary and historic secret writings called Cipher.