David Yates (in-universe)

The 'Mayor of the City of London is a Muggle individual.

Millennium Bridge disaster
"The police are continuing with the investigation into the cause of the Millennium Bridge disaster. Traffic has been halted as police search for survivors. The surrounding area remains closed. The Mayor has urged Londoners to remain calm..."

- A Muggle radio broadcast

After the collapse of the Millennium Bridge at the hands of Fenrir Greyback and a group of Death Eaters, the Mayor urged Londoners to remain calm, for this was a most unusual event.

Appearances

 * Harry Potter and the Half-Blood Prince (film)