A host of events are taking place between the Humber and the River Tees to celebrate Yorkshire Day.
As well as the traditional reading of the Yorkshire Declaration of Integrity at the four ancient entrances to the city of York, highlights of this year's celebrations include the annual Yorkshire pudding tossing competition and straw bale race at York Maze.
In Redcar - which is part of the historic North Riding of Yorkshire - there will be a reading of the Yorkshire Declaration of Integrity at Redcar town clock by actor Chris Foote-Wood dressed as local hero Samuel Plimsoll.
And in Beverley, The East Riding Theatre is celebrating everything Yorkshire including storytelling, poetry, music, painting, film as well as food, beer, tea and even coffee roasted in the county.
Other attractions joining in the celebrations will be the National Railway Museum in York and Old Mother Shipton's Cave, in Knaresborough - said to be the oldest tourist attraction in England.
York Maze owner Tom Pearcy said: "The Straw Bale Race has become a Yorkshire Day tradition at York Maze. The aim of the contest is to roll a giant round bale of straw along a 50m course.
"We are also staging a Yorkshire pudding tossing competition where someone will be crowned Yorkshire pudding throwing champion. Yorkshire puddings will be on the menu too, filled with delicious locally produced Yorkshire sausages and onion gravy."
He said the winner of the biggest throw will receive a crown made from Yorkshire pudding.
Yorkshire Day was first celebrated by the Yorkshire Ridings Society on August 1, 1975.
The society was formed a year earlier to campaign for the traditional boundaries of Yorkshire which were substantially altered by a radical mid-1970s local government reorganisation.
According to the society, August 1 was chosen as it is the date of the Battle of Minden, in Germany, in 1759.
The battle is marked by the Army by allowing soldiers to wear roses in their caps and Yorkshire regiments have traditionally sported the white rose.
The society calls on all Yorkshire people to wear a white rose on Yorkshire Day.