The manuscript collection of Sir Thomas Phillipps was almost certainly the largest private collection ever assembled. Its dispersal during the century after his death in 1872 scattered his manuscripts into public and private collections around the world. These included many collections in North America, several of which now count former Phillipps manuscripts among their greatest treasures. This paper examines the extent to which Phillipps manuscripts are now held in institutional collections in North America and traces the history of their acquisition.