I am aware of the -u option in htop, where I can show only processes of a given user, such as:
htop -u root I am wondering whether there is a way to show processes of all user except root.
This is not possible, as of htop 0.8.3.
Source: the source code.
The best you can do is sort processes by user, root's processes will be conveniently lumped together.
htop version?