The 1968 National Challenge Cup was the 55th edition of the United States Soccer Football Association's annual open soccer championship. No North American Soccer League teams played in the tournament because it was during the offseason and it was when National Professional Soccer League and United Soccer Association were merging at the time.
The 1968 National Challenge Cup, as an annual open soccer championship organized by the US Soccer Football Association, was held during a time when the North American Soccer League teams were not participating due to it being the offseason and coinciding with the merger of the National Professional Soccer League and the United Soccer Association.