Abstract: A collapsible saw has a mechanism for releasably tensioning and locking a saw blade into position while also conferring lateral support for the blade, namely a cam lock mechanism. Additionally, a long channel member, a short member, and a saw blade are each pivotably connected in the saw assembly. The long and short member pivot connection is releasable in a manner that allows the long and short member to nest one within the other along with the saw blade. A collapsible saw according to the present invention is highly compact and entirely interconnected such that loss of saw parts is not a concern. Another feature of the saw is that its interconnections and design yield a configuration that can be quickly expanded into an operative configuration or place in a collapsed configuration.