The festival will show two of his films he selcted himself - What's Eating Gilbert Grape and Chocolat.
Hallstrom, whose international break was My Life as a Dog - and whose latest feature, The Hoax, had its world premiere at the RomeFilmFest - will make a short film which will screen out-of-competition in a new festival section, Mobile Movies.
The other 10 entries with the theme of Together, are shot by local directors on Nokia N93 (see http://www.nokia.se/stockholmfilmfestival/mobile_movies/).
US director Darren Aronofsky, whose two previous features, Pi and Requiem For A Dream, have both been in competition at Stockholm, will try a third time with The Fountain, the Rachel Weisz starrer launched in Venice.
The competition for another Bronze Horse includes 20 first, second or third features, to to be kicked off by US director John Cameron Mitchell's controversial sex-drama-comedy Shortbus, his second visit to Stockholm, after Hedwig And The Angry Inch.
The only Nordic contender is Norwegian director Erik Richter Strand's feature debut, Sons.
"Stockholm is a festival for young cinema - no less than a third of the films in the programme are made by first-time directors," said festival director Git Scheynius, opening with US director Todd Field's Little Children (his second), and concluding - after 169 titles in 10 theatres- with UK director Kevin MacDonald's first, The Last King of Scotland.
This year's Spotlight is on six new Arab features. Among the 15 sidebars are sections of Asian Images, American Indies and Northern Lights, a package of recent Nordic cinema.
Three local directors - Roy Andersson, Daniel Wallentin, Johan Brisinger - will show excerpts from their films still in production and discuss with audiences.