Jackie Robinson's contract with the Brooklyn Dodgers -- one of the most important documents of all time -- is hitting the auction block and it's expected to fetch MILLIONS ... TMZ Sports has learned.
The 1947 contract -- which made Robinson the first black player to sign with an MLB team -- will be sold along with Jackie's 1945 contract with the Montreal Royals, the Dodgers minor league team.
Bidding on the items, hosted by Goldin Auctions, began on Monday ... starting bid was $5 MILLION.
We spoke with Ken Goldin who tells us he's had the items appraised by a rare documents expert who valued the pair at $36 million.