MADRID — All 90 people wanted information deleted from the Web.

Among them was a victim of domestic violence who discovered that her address could easily be found through Google. Another, well into middle age now, thought it was unfair that a few computer key strokes could unearth an account of her arrest in her college days.

They might not have received much of a hearing in the United States, where Google is based. But here, as elsewhere in Europe, an idea has taken hold —individuals should have a “right to be forgotten” on the Web.

Spain’s government is now championing this cause. It has ordered Google to stop indexing information about 90 citizens who filed formal complaints with its Data Protection Agency. The case is now in court and being watched closely across Europe for how it might affect the control citizens will have over information they posted, or which was posted about them, on the Web.

Whatever the ruling in the Spanish case, the European Union is also expected to weigh in with new “right to be forgotten” regulations this fall. Viviane Reding, the European Union’s justice commissioner, has offered few details of what she has in mind. But she has made clear she is determined to give privacy watchdogs greater power.