TUC general secretary Brendan Barber is to retire later this year, he announced today.
He has been in the role since June 2003.
He said: "I have decided that this is the right time to make a change in my life. I have been enormously privileged to work at the TUC since 1975, and the end of the year will mark the 10-year point since my election as general secretary.
"The TUC has always been a powerful voice for the millions of ordinary people who depend on trade unions to better their lives and there is so much of our work over the years in which I take great pride. But I have every confidence that under new leadership the TUC can go from strength to strength."