Here's a list of London locations connected to the phenomenal Boy Wizard's story; as well as some Potter-themed tours, shops and special events to indulge your Harry devotion.
Harry Potter London Film Locations
King's Cross Station
The railway connection between the Muggle world and Hogwarts leaves from Platform 9 3/4 at King's Cross Station, a platform concealed behind a solid wall barrier.
It was at King's Cross that JK Rowling's parents first met, travelling on a train to Scotland; the author says the station is 'evocative and symbolic' for her.
Today, you can pose for pictures alongside the platform sign and a trolley 'stuck' between our world and the wizarding one.
In the films, the layout of King's Cross posed a problem: platforms 9 and 10 aren't actually adjacent. Instead, the filmmakers renamed platforms 4 and 5 for the filming. If you're interested in visiting the location in the film, you'll need to head to the arches between these two platforms.
St Pancras Station
With its more picturesque exterior, neighbouring St Pancras Station is used in the Harry Potter films as the outside of King's Cross. As fans of George Gilbert Scott's incredible gothic cathedral, we can't really blame them.
Harry and Ron memorably park their Ford Anglia on the station courtyard in Harry Potter And The Chamber of Secrets, only to miss the Hogwart's Express, and be forced to fly over and around that impressive clock tower.
London Zoo's Reptile House
Check if you also have Harry's gift of Parseltongue by heading to London Zoo's Reptile House. It is here, in Harry Potter And The Philosopher's Stone, that Harry inadvertently converses with and frees a Burmese Python, and ends up trapping his awful cousin Dudley Dursley in the snake tank instead. (The details differ a little in the books: the snake is a Boa Constrictor and Dudley doesn't end up in the tank. Plus, it isn't specified as London Zoo in the book.)
In the film, you can clearly see the statue to Guy the Gorilla, one of London Zoo's most famous residents, outside the Reptile House.
The beautiful Victorian covered market in the City of London, Leadenhall Market is partly used as the wizard-world shopping street Diagon Alley in Harry Potter and the Philosopher's Stone.
The entrance to wizarding pub and inn, The Leaky Cauldron in this film, is an opticians in Bull's Head Passage, inside Leadenhall.
As the films move on, some locations change. The Leaky Cauldron moves from Leadenhall Market to Borough Market in Harry Potter and the Prisoner of Azkaban. In the later film, the entrance to the wizards' pub and inn is located at 7 Stoney Street beneath the railway bridge in Borough.
The shop next door at Number 8 is the Third Hand Bookshop, (on Charing Cross Road in the books), where Harry meets Gilroy Lockhart, his future tutor.
Australia House, Strand
The imposing Australian High Commission in London, Australia House is used as Gringott's Bank in several of the Harry Potter films. While its wonky exterior is clearly the work of some CGI, peek inside the doors and you'll see the gorgeous marble interior and sparkling crystal chandelier that's destroyed by our favourite wizarding trio and a dragon in Harry Potter and the Deathly Hallows Part II (about 1 minute into the clip below).
Westminster Tube, Scotland Place
Harry Potter and Mr Weasley use Westminster tube station in Harry Potter and the Order of the Phoenix on their way to Harry's hearing at the Ministry of Magic. "Trains! Underground! Ingenious, these Muggles," says muggle sympathiser Mr Weasley. Neither his excellent muggle knowledge nor his magic powers stop him struggling with the barriers though. Think of that next time your oyster fails to a volley of passive-aggressive tutting behind you.
From Westminster tube, it's on to the Ministry of Magic in Westminster. If you're looking for the red phone box that makes the visitor's entrance, you'll be disappointed. The box, located in Great Scotland Yard, running between Whitehall and Northumberland Avenue, at the junction with Scotland Place, was only added for filming. As the excellent movie-locations.com notes, if there's half a trolley in Kings Cross, couldn't someone move a phone box here to create a brilliant photo opportunity?
Look out for the fake bridge that was added to conceal a doorway:
City Hall, Millennium Bridge
London's under threat at the beginning of Harry Potter and the Half Blood Prince. Workers on the upper floors of City Hall in More London near Tower Bridge (where else has those oddly sloping windows) notice a mysterious disturbance...
Then the Death Eaters swoop, taking in some top London landmarks: Trafalgar Square, St Martin in the Fields, Charing Cross Road, past Leicester Square tube station, before turning right into Great Newport Street, and into where Diagon Alley seems to be in this film.
After picking up someone, (or something!), it's back over St Paul's Cathedral and time to destroy the Millennium Bridge...
Ahh, the famous Surbiton Station, immortalised in Harry Potter and the Half-Blood Prince. Except... it's not quite right. There's a blink-and-you'll-miss-it moment for the south west London station; Harry meets Dumbledore on Platform 3 (below a nudge-nudge, wink-wink built-for-the-film billboard) before the pair apparate off to the village of Budleigh Babberton.
But if you're looking for the moody station cafe where Harry reads his Daily Prophet and nearly gets a date with a gorgeous waitress, well, it doesn't really exist.
After all the film premieres in London's West End, Ron, Harry and Hermione finally get to London's theatreland in Harry Potter's final chapter, Harry Potter and the Deathly Hallows Part 1.
Escaping from the attack on Bill and Fleur's wedding, the trio apparate to Piccadilly Circus, at the foot of Shaftesbury Avenue, narrowly missing a speeding No19 bus.
Their adventures in the West End include an eventful cappuccino in a cafe that's actually a set.
But through the windows, you can see Chris Bryant's Musical Instruments across the street, perhaps they're supposed to be in Denmark Street, once called Tin Pan Alley, at Tottenham Court Road. (Incidentally, the three apparate to Tottenham Court Road in the book.)
The trio then walk through the terribly unglamorous Trocadero columns on Great Windmill Street, before heading back to Piccadilly Circus.
Plus some London locations that are less public...
Harrow Old Schools
Professor Flitwick’s Charms Class in the first Harry Potter film, where Hermione manages to levitate a feather (Wingardium Leviosa! if you're wondering), takes place in the Fourth Form Room of Harrow Old Schools, Harrow-on-the-Hill.
Hampstead Garden Suburb
Hermione's lovely house in NW11 is Heathgate at Meadway in Hampstead Garden suburb, a gorgeous part of London built in the early 20th century, but modelled on a Medieval village, centred around the church of St Jude-on-the-Hill, seen at the end of this moving clip.
Harry Potter Tours and Experiences
If you're interested in doing a Harry Potter tour in London, you're slightly spoilt for choice. You can choose a free DIY tour, courtesy of Richard Jones, downloadable from the-magician.co.uk.
Harry Potter Shops, Special London Events and More
There's a permanent Harry Potter merchandise store inside Kings Cross Station.
Called The Harry Potter Shop at Platform 9 3/4, the store offers Potter souvenirs like pens and pencils themed around the Hogwarts' Houses, as well as books, cuddly toys, clothing and wands.
Did we miss anything? Please let us know in the comments below, and we'll add them in...