Broadway Malyan, Camlin Lonsdale, Gillespies, Gross Max, Gustafson Porter and Patel Taylor will fight it out to pick up the commission.
The group saw off more than a hundred expressions of interest from around the world to get this far.
The designer that wins the contest will draw up detailed landscape plans for the Eastside City Park.
The shortlisting panel included a representative of CABE Space, Landscape Institute president Kathryn Moore and Birmingham City Council's city design advisor Philip Singleton.
The teams will prepare concept design schemes and technical reports over the next two months, for submission in mid-September.
Councillor Ken Hardeman, cabinet member for regeneration, said he was excited by the competition.
'Birmingham is reinventing itself: acclaimed changes in the city centre over the last two decades have revolutionised the city and how it feels to live and work here.
'The Eastside project is continuing this for the 21st century by creating a new piece of city centre and at the heart of this transformation will be a new park, the first to be made in the city centre for more than a century.
'I welcome the interest and commitment shown by the design community in this unique opportunity to define a new part of Birmingham's city centre,' Hardeman added.
A winner is expected in November or December.