Tony Barrow represented the band between 1962 and 1968 and also wrote sleeve notes for their early albums, as well as the strip cartoon for the Magical Mystery Tour booklet.
Mr Barrow died on Saturday night, aged 80, at his home in Morecambe.
He had also represented other Merseybeat acts such as Gerry and the Pacemakers and Cilla Black.
Born in Crosby in 1936, Mr Barrow was poached from the Decca record group in 1962 by The Beatles' manager Brian Epstein.
Beatles expert Spencer Leigh said he was an unassuming cog in the band's success and had the "unusual" task for a press officer of reining in the publicity they received.
"The majority of press officers are trying to get publicity for their performers but The Beatles had so much publicity that he was trying to draw it back at times."
"He had to be with Brian Epstein, who was a very temperamental manager - Tony told me that he'd been sacked at least a dozen times by Epstein, but he always took him back the next day", he said.
Mr Barrow was with the band when they met Elvis Presley for the first and only time, at his Beverly Hills mansion on 27 August 1965.
He said they were "initially put off by the fact that the press might be involved" but ended up jamming with the King of Rock 'n' Roll.
Mr Barrow went on to set up his own PR company, representing Wings and managing Lyn Paul of the New Seekers and Helen Shapiro, before retiring in 1980.
He is survived by his widow, Corinne, and his two sons.

The injured pedestrian - a young man - is thought to have been walking with a group of people from a graduation ceremony at the Caird Hall.
The incident took place on High Street at about 18:00.
The man's injuries are believed not to be life-threatening. The driver of the taxi is thought to be uninjured.

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A day before turning 43, the oldest rider in the event beat Russian Olga Zabelinskaya, who returned from a doping ban last year, by 5.55 seconds.
Dutch rider Anna van der Breggen, winner of the road race, took bronze.
Great Britain's Emma Pooley, who, like Armstrong, came out of retirement to compete in Rio, finished 14th.
Find out how to get into cycling with our special guide.
Pooley, 33, told BBC Radio 5 live she "struggled with the blustery crosswind" on the hilly 29,7km course.
"The weather was a bit different to what we expected," she said. "I had to ditch my visor halfway round because it got steamed up.
"Some people are just better at cornering in the wet, I guess."
Armstrong became the first person to win the same road cycling event at three Olympics.
Having won the time trial at Beijing 2008, she retired in 2009 to start a family before returning to win gold at London 2012 and retiring again.
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He is currently the managing director of retail banking for the Ulster Bank group.
Mr Donnan replaces Ellvena Graham, who is becoming a non-executive director of the bank.
She held the position as â€Žhead of Ulster Bank Northern Ireland since it was created just over two years ago.
Ulster Bank is the largest bank in Northern Ireland and the third largest in the Republic of Ireland.
Its chief executive Jim Brown said: "I would like to wish Ellvena well as she departs her executive role.
"She has always been a positive and energetic influence on the business with a solid understanding of what matters for our people and our business.
"She has also been a great support to me personally."
Mr Donnan has been with Ulster Bank for about 25 years.
The Beatles' former press officer, who coined the term 'The Fab Four' to describe the band, has died.
[NEXT_CONCEPT]
A pedestrian has been struck by a taxi in Dundee after it mounted the pavement.
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American Kristin Armstrong won the Olympic women's road time trial for the third time in succession with victory in Rio.
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Ulster Bank has appointed Richard Donnan as its new boss in Northern Ireland.