Sir John Reynwell (also spelt Rainwell; died 1445) was Lord Mayor of London.
In 1427 he started work on a new gate and drawbridge in an undocumented part of the city.
He was Member of Parliament for the City of London in 1410, 1415, 1433 and 1445 as one of the two aldermanic representatives.
This design reflected the arms of the ancient Guild of Fishmongers, similar to those of the present Worshipful Company of Fishmongers (see that article - and whoever originally entered this text used the name of Askham, another Lord Mayor, not Reynwell, so this may be in error).
This article about a Lord Mayor of London is a stub.