- Old Watch House, Bishopsgate
- Old Wool Quay
- Old Yard
- Olde Hall
- Olde Swanne Alley
- Olivaunt
- Olive Court, St. Katherine's
- Oliver's Court
- Olvendebrigge
- One Swan Yard
- One Tun Yard
- Oram's Court
- Orance Court
- Ormond Place
- Le Osyer Yarde
- (St.) Osyth
- Owyn Win Newgate
- Oxenden Corner
- (Earl of) Oxford, Hostel of
- Oxford Armes Inn
- Oxford Arms Inn
- Oxford Arms Passage
- Oxford Arms, Oxford Arms Inn
- Oxford Court
- Oxford Court, Camomile Street
- Oxford Lane
- Oxford Place
- Oxford's Almshouses
- Oynters
- Oyster Gate
- Oyster Hulle
- Oystershell Court
- Packer Buildings
- Packer Court
- (Lady) Packlon Almshouses
- The Painted Seld
- Painted Tavern Lane
- Painters' Company
- Painters' Hall or Painter Stainers' Hall
- Pakkemanny's Wharf
- Pakyngton's Rentes
- Palace Court Office
- Palmereslane
- Palmersten Buildings
- Palmerston House
- (St.) Pancras, Soper Lane
- Pancras Alley
- Pancras Lane
- Panetaria
- Panyer Alley
- Paper Buildings
- Paper Street
- The Papey
- (Mr. Thos.) Papillon's House
- Papinger Alley
- Paradise
- Pardon Churchyard
- Pardon Churchyard, Smithfield
- Parish Chaplains
- Parish Clerks
- Parish Clerks' Hall
- Parish Priests
- Parishes
- Parkerislane
- Parker's Court
- Parker's Gardens
- Parker's Rents
- Parker's Yard
- (St.) Parnell
- Parrot Alley, Aldgate high Street
- Parson's Court
- Parsons' Court
- Parsons' Rents
- Parsons' Stairs
- Partridge Court
- Passage to the Hospital
- Passage to Wood Street
- Passage to ye Square
- Passeke's Wharffe
- Paternoster Alley
- Paternoster Avenue
- Paternoster Church
- Paternoster Lane
- Paternoster Lane, Street
- Paternoster Rents
- Paternoster Row
- Paternoster Square
- Paternoster Street
- Paternosterchurch Street
- Patrick's Court, Houndsditch
- Patrick's Garden
- Pattenmakers' Company
- (St.) Paul's Alley, Court, Fenchurch Street
- (St.) Paul's Bakehouse
- (St.) Paul's Bell Tower
- (St.) Paul's Brewery
- (St.) Paul's Cathedral
- (St.) Paul's Chapter
- (St.) Paul's Chapter House
- (St.) Paul's Charnel House