The University of Duesseldorf's philosophy faculty decided on Tuesday that she had carried out "a deliberate deception through plagiarism".
The minister has denied the claims and said she will appeal.
An earlier plagiarism row brought an end to the political career of Germany's defence minister in 2011.
Large parts of Karl-Theodor zu Guttenberg's 2006 legal dissertations were found by Bayreuth University to have been copied and he stood down before it issued its damning verdict in May 2011.
Using the same words as Duesseldorf's Heinrich Heine University, it concluded that he had "deliberately deceived".
When Ms Schavan became the second minister in Chancellor Angela Merkel's government to be accused of copying her doctorate, in this case by an anonymous blogger, she insisted she had never "knowingly falsely cited any sources" and promised to respond to the accusations.
But the faculty committee concluded that her work, which dealt with the formation of conscience, included a "substantial number of unaccredited direct quotes from other texts".
In a statement declaring the doctorate invalid and withdrawing it from Ms Schavan, the faculty head Bruno Bleckmann said they had "decided by secret ballot, by 12 votes to two, with one abstention".
The minister herself, 57, was said to be on a five-day education and science co-operation trip to South Africa.. Education minister since 2005, she is described as a close colleague of Chancellor Merkel.
Her lawyers reportedly rejected the university's ruling and said Ms Schavan would appeal.
When the university announced its inquiry, she said she had no intention of standing down.
But the investigation into one of Chancellor Merkel's closest allies is seen as potentially awkward months before Germans vote in federal elections.
The popular German newspaper Bild said the news was a bitter blow to the chancellor, and wondered whether she would need to find a new education minister at the start of her election campaign.
- 12/03/2014 Riot police intervene in protests in Istanbul and Ankara
- 11/03/2014 OSCE Chair says Crimean referendum in its current form is illegal and calls for alternative ways to address the Crimean issue
- 11/03/2014 General Veli Kuchuk released from detention In Turkey
- 11/03/2014 NATO foreign ministers plan to re-evaluate relations with Russia in Brussels on April 1-2
- 11/03/2014 Head of EU Delegation to Azerbaijan: “We are ready to give both financial and political support to Ukraine”
- 11/03/2014 Cypriot central bank governor resigns
- 10/03/2014 New round of EU-U.S. trade talks kick off in Brussels
- 10/03/2014 Ousted Yanukovych to address media before Crimea referendum
- 10/03/2014 Turkish 'coup' convicts freed amid political turmoilts - UPDATED
- 10/03/2014 Council of Europe calls referendum in Crimea travesty
- 10/03/2014 German Foreign Minister warns Russia
- 08/03/2014 Tatars flee Crimea for western Ukraine
- 07/03/2014 Suspected Russian spyware Turla targets Europe, U.S.
- 07/03/2014 Turkish president rejects Facebook, YouTube ban over wiretaps
- 07/03/2014 Top lawmaker: Russia would welcome Crimea
- 07/03/2014 U.S., Bulgaria, Romania to hold joint naval drill in Black Sea: statement
- 07/03/2014 Turkey’s former Chief of Staff İlker Başbuğ released from jail after top court ruling
- 07/03/2014 Ahmet Davutoglu: “Crimea should remain as an autonomy under Ukraine”
- 07/03/2014 Turkey could ban Facebook and YouTube
- 07/03/2014 Istanbul prosecutors prepare new indictment for Gezi Park protests
- 07/03/2014 Erdoğan signals gov't may shut down Facebook, YouTube after local polls
- 07/03/2014 Macedonia schedules early elections for April 27
- 06/03/2014 EU Freezes Talks With Russia on Cooperation Agreement, Visas
- 06/03/2014 Several injured in Italy's train crash
- 06/03/2014 More U.S. jets on NATO patrol in Baltics
- 05/03/2014 EU freezes assets of 18 Ukrainians
- 05/03/2014 EU going to provide €11bn financial aid to Ukraine
- 05/03/2014 Oil prices drop as Ukraine worries ease
- 05/03/2014 EU Plans No Sanctions on Russia for Now – Russian Envoy
- 04/03/2014 EU energy commissioner says European Union needs Russian gas
- 04/03/2014 EU to help Ukraine pay Russian gas bill
- 04/03/2014 Romanian senate president resigns
- 04/03/2014 Russian foreign minister arrives in Madrid
- 04/03/2014 Hungarian PM calls for negotiations on Ukraine
- 04/03/2014 Turkey scrambles eight jets to intercept Russian surveillance aircraft
- 04/03/2014 Poland calls for emergency NATO meeting
- 04/03/2014 Turkey: We will always stand by Crimean Tatars
- 04/03/2014 Romanian PM announces new cabinet
- 04/03/2014 Media censorship and intimidation of journalists in Ukraine must stop, says OSCE media representative
- 04/03/2014 Russian and German foreign ministers begin talks in Geneva