Six-figure pay and perks packages are enjoyed by some 38 union bosses, the TaxPayers' Alliance has claimed.
They include union leaders threatening to oppose likely public sector job losses and pension cuts with strike action, the campaign group said.
It branded figures such as Unison's Dave Prentis, Unite's Derek Simpson and the RMT's Bob Crow as "hypocritical" given their lives of "well-paid luxury".
Matthew Elliott, chief executive of the TaxPayers' Alliance, said: "It is small wonder that they aren't worried about the tax burden or the national debt when they are so well-off, but it is ordinary, over-stretched taxpayers who will suffer if they get their way.
"Their bluster should be ignored, and the Government should stop pouring taxpayers' money into union coffers, as they clearly have more than enough cash already."
The TaxPayers' Alliance said it had researched its "Trade Union Rich List" on figures from the annual report of the certification officer, David Cockburn, who oversees union finances.
The remuneration packages cited represented a combined figure for salary and benefits, including pension contributions, for 2008/9.
Top of the list was Gordon Taylor, chief executive of the Professional Footballers' Association, who earned £856,007 according to the TaxPayers' Alliance.
But the campaign group drew particular attention to those union leaders representing public sector workers.
It said that Mr Prentis was on £127,436, Mr Simpson was on £120,328 and Mr Crow was on £105,679. Christine Blower, of the National Union of Teachers, earned £124,483, while the Fire Brigades Union's Matt Wrack was on £115,804, and the Public and Commercial Services Union's Mark Serwotka earned £111,112.