Hide GM dice rolls

Is there a way to hide GM dice rolls from your players. The only way I've seen is to use the /r commands.

Do you mean when players make a roll, you only want the GM to see the result?  Roll20 just released the /secretroll (/sr) and /supersecretroll (/ssr) functionality, that does exactly that. However, it works like a regular roll command, and doesn't allow for inline rolls or roll templates to be used. If you mean that you as GM want to make a roll and not have your players see it, then you can simply whisper it to yourself as GM. Here's an example, that only you as GM will /w gm [[1d20 +10]] 

or /gmroll d20 /gr d20