Best SF Book Publisher Hugo Category

The Best SF Book Publisher Hugo lasted for only two years, 1964 and 1965 before being dropped. (Apparently, it was a one-time category created by Pacificon II which Loncon I incorrectly thought was a permanent category.) No modern category covers publishers.

See also the Hugo Awards and List of Hugo Categories.

1964 Best SF Book Publisher Hugo: Ace
1965 Best SF Book Publisher Hugo: Ballantine