Abstract: A novel self propelled "big bale" stacker and retriever capable of stacking 4 by 4 by 8 foot, 3 by 4 by 8 foot, or pairs of 2 by 3 by 8 foot bales in 8 by 8 foot stable, tied units is presented. The stacker of the present invention utilizes a novel "jaw"-like arm that clamps onto a bale lying in a field. The arm swings up vertically and deposits the bale on a rotatable horizontal platform. The rotatable platform rotates 180 degrees to make room for a second bale next to the first. After two bales have been loaded onto the rotating platform, the platform tilts up 90 degrees to deposit the bales on the stacker's bed. By rotating the platform 90 degrees before depositing the bales on the bed, the orientation of the bales in successive tiers can be alternated so as to produce stable, "tied", 8 by 8 by 16 foot stacks.