Casper ten Boom (18 May 1859 – 9 March 1944) was a Dutch Christian who helped many Jews and resisters escape the Nazis during the Holocaust of World War II.

While Willem and Nollie married and moved away, he lived with his two unmarried daughters, Betsie and Corrie, in their home and watchmaking workshop.

The Dutch Reformed Church "protested Nazi persecution of Jews as an injustice to fellow human beings and an affront to divine authority.

[6] His son Willem, a minister in the Dutch Reformed Church, also worked in a nondenominational nursing home.

[3] On 28 February 1944, the Gestapo raided his house and arrested him; his daughters; his son Willem; and his grandson Peter, who were visiting.

The Gestapo arrested other supporters, who visited the house during the day, taking a total of about 30 people to Scheveningen prison.

"[2] On 9 March, Casper died at the Hague Municipal Hospital, at the age of 84, after nine days in Scheveningen prison.

Willem's son Christiaan (commonly known as Kik), 24, was sent to the Bergen Belsen concentration camp for his work in the underground and died there during the war.