quality:corruption, information:highlighting, structural:reformatting
2015 European migrant crisis

Throughout the course of the European migrant crisis, Merkel encouraged cooperation between EU member states, urging that Europe needs to act "as a whole".

In late August 2015, at the height of the crisis, Merkel's government suspended the Dublin Regulation, which stipulated that asylum seekers must seek asylum in the first EU country they arrive. Merkel announced that Germany would also process asylum applications from Syrian refugees if they had come to Germany through other EU countries. That year, nearly 1.1 million asylum seekers entered Germany. Merkel coined the phrase Wir schaffen das (literally 'We can do this') around this time.

Junior coalition partner and Vice Chancellor Sigmar Gabriel said that Germany could take in 500,000 refugees annually for the next several years. German opposition to the government's admission of the new wave of migrants was strong and coupled with a rise in anti-immigration protests. Merkel insisted that Germany had the economic strength to cope with the influx of migrants and reiterated that there is no legal maximum limit on the number of migrants Germany can take. In September 2015, enthusiastic crowds across the country welcomed arriving refugees and migrants.

Horst Seehofer, leader of the Christian Social Union in Bavaria (CSU) — the sister party of Merkel's Christian Democratic Union — and then- Bavarian Minister President, attacked Merkel's policies. Seehofer criticised Merkel's decision to allow in migrants, saying that " in a state of mind without rules, without system and without order because of a German decision." Seehofer argued that as many as 30% of asylum seekers arriving in Germany claiming to be from Syria are in fact from other countries. He argued for a punitive reduction in EU funding for member countries that rejected mandatory refugee quotas. Meanwhile, Yasmin Fahimi, secretary-general of the Social Democratic Party (SPD), the junior partner of the ruling coalition, praised Merkel's policy allowing migrants in Hungary to enter Germany as "a strong signal of humanity to show that Europe's values are valid also in difficult times". Merkel's approval rating dropped to 54% in October 2015, the lowest it had been since 2011.

In November 2015, there were talks inside the governing coalition to stop family unification for migrants for two years and to establish "Transit Zones" on the border. Additionally, there were plans to provide housing to migrants with a low likelihood of getting approved for asylum until the processing of their application. This led to increased tensions between the CSU, who were generally in favour of these measures and threatened to leave the coalition without them, and the SPD, who opposed them; Merkel agreed to the measures. The November 2015 Paris attacks prompted a reevaluation of the German government's stance on EU migration policy. While she did not directly limit the number of immigrants, Merkel tightened asylum policy in Germany, for example through more thorough vetting of migrants with respect to internal safety and security.

In August 2016, following the Würzburg train attack in Germany and various other Islamist terror attacks in Europe, Merkel's approval rating dropped to 47%. Half of Germans did not want her to serve a fourth term in office, with only 42% in favour of another term in office. In a poll from October that year, her approval rating was found to have risen again; 54% of Germans were found to be satisfied with the work of Merkel as Chancellor. According to another poll taken in November 2016, 59% were to found to be in favour of a renewed Chancellorship candidature in 2017. According to a poll carried out shortly after the 2016 Berlin truck attack, 56% of Germans named Merkel as a political leader they trusted to solve their country's problems.

In October 2016, Merkel travelled to Mali and Niger. The diplomatic visit took place to discuss how their governments could improve conditions which caused people to flee those countries and how illegal migration through and from these countries could be reduced.

The migrant crisis spurred right-wing electoral preferences across Germany with the Alternative for Germany (AfD) gaining 12% of the vote in the 2017 German federal election. These developments prompted debates over the reasons for increased right-wing populism in Germany. Some researchers have argued that increased right-wing preferences are a result of the European migrant crisis, particularly the increasingly common perception that refugees constitute an ethnic and cultural threat to Germany.

Some observers have described Merkel's policymaking with respect to the migrant crisis as a success. In 2022, the United Nations' High Commissioner for Refugees granted Merkel the Nansen Award for her "courage and compassion" during the crisis. However, Merkel has also faced significant criticism, particularly with regards to her policymaking early in the crisis, which some critics describe as hypocritically unilateral.