The Federal Constitutional Court reported that it had rebuffed the Greens’ application yesterday for an injunction which would have forced a bill to be sent to lawmakers.
A survey earlier this year found that 75 percent of Germans favor complete legal equality for gay people in life partnerships.
That amount of support is higher than it was in the UK the day before same-sex marriage became legal in 2014.
Parliament would have voted on the bill on June 30, during its last session before the election – but same-sex marriage will now continue to be out of reach for LGBT Germans.
Over the weekend, the Green Party made same-sex marriage a condition of entering a coalition.
The opposition party pledged that it would only enter a coalition deal on the condition that same-sex marriage is finally legalized in the country.
Germany has allowed same-sex couples to enter civil partnerships since 2001.
However, the government has ruled out any progress on equal marriage due to a strict coalition agreement.
At present, Germany is governed via a Grand Coalition comprised of the centre-left Social Democratic Party (SPD) and Angela Merkel’s right-wing Christian Democratic Union (CDU), along with the Christian Social Union in Bavaria.