The 2,500 construction workers at the Mane Garrincha stadium stopped work on October 27 demanding, among other things, advance holiday pay, time off at the end of the year and access to dental treatment.
The agreement between the workers and the construction companies was signed at Brasilia's labour tribunal on Friday, said union official Raimundo Salvador Braz, adding that workers had "moved forward."
Built in 1974, the stadium's capacity will be increased from 45,000 to around 70,000 for 2014 following rebuilding.
Brazil's preparations for the event have been dogged by delays, worries over transport, airports and crime and claims that football's governing body FIFA is trying to ride roughshod over Brazilian law.
There have already been strikes at the Mineirao stadium in Belo Horizonte and Rio de Janeiro's Maracana this year.
