Workers in the private sector saw their average pay rise by 6.9% between August and October, according to the Office for National Statistics (ONS).
That compares to wage growth of just 2.7% for public sector employees.
Thousands of workers are set to go on strike this week, including nurses who expect to stage their first-ever nationwide walkout on Thursday.
The 4.2% difference between pay growth in the public and private sectors is just below the 4.4% gap seen between July and September. The figures do not include distortions caused by the pandemic.
* Staff at Royal Mail who are members of the CWU will take strike action on Wednesday and Thursday. This will be followed by further walkouts on 23 December and Christmas Eve.
* Nurses and ambulance workers are also planning industrial action later this month.
The ONS said that 417,000 working days were lost to strikes in October - the highest since November 2011.
Sam Beckett, head of economic statistics at the Office for National Statistics, said that the sectors that have been hardest hit by strike action are transport and storage as well as information and communications.
"That's been largely driven by the rail and mail strikes," she told the BBC's Today programme.
Ms Beckett said it was difficult at this stage to assess how industrial action has affected the wider economy.
"We haven't really seen the influence of that in our GDP statistics yet. It is too early to say how it will hit the economy more broadly," she said.
Overall, the unemployment rate rose to 3.7%. The number of job vacancies also fell, down 65,000 in September to November, which was the fifth consecutive fall for this measure.
Ms Beckett said the decline was a sign the jobs market "could be starting to soften a little" and an indication that some businesses were "were starting to pull some of their vacancies because they are reducing activity".
However, despite the fall, the ONS said job vacancies still remained close to historically high levels, with nearly 1.2 million roles available.
There was also a decline in the number of people classed as economically inactive, which is those who are not in employment and have not sought work in the past few weeks. The most notable drop was among those aged between 50 and 64.
Jack Kennedy, UK economist at recruitment firm Indeed, said there was "evidence of some people returning to the labour force from retirement".
"That may be an early sign of cost-of-living pressures prompting some people to rethink their plans," he said.
But overall, inactivity remains more than 560,000 higher than pre-pandemic levels and continues to fuel recruitment challenges across a range of sectors, said Mr Kennedy.
Kai Clarke, who works at Purple Jay Nurseries' branch in Lambeth, said she was grateful for the 16% pay rise the firm had managed to provide for its workers - although it has quickly been absorbed.
"I would say that I'm happy and I'm grateful but the excitement has worn off because I've noticed it is all going into the bills. Even simple things like juice, milk and butter have gone up."
While the manager of the nursery, Jarrod Ayling, told the BBC that putting wages up would have a big impact on his costs too, he said it was "needed because of the supply and demand situation" and the struggle to find recruits.