Contributions will be distributed to four nonprofit groups—Doctors Without Borders, the International Rescue Committee, Save the Children and the UN High Commissioner for Refugees.
"These nonprofits are helping deliver essential assistance - including shelter, food and water, and medical care - and looking after the security and rights of people in need," Google wrote on its One Today page Tuesday.
Thousands of refugees, many fleeing conflict in Syria, have flowed into Europe this summer. Many migrants reaching the continent have faced crowded temporary camps, limited food and unsanitary conditions.
European governments have scrambled to handle the influx, with some countries re-establishing temporary border controls in recent days. Leaders are now planning how to relocate about 120,000 asylum seekers.