It looks like zenity uses the global font settings and does not have an option to override it. 

Why do you need to change it? 

On 31 Dec 2011, at 0014, Todd And Margo Chester wrote:

> Hi All,
> 
> I am using Scientific Linux 6.2 x64 (RHEL clone):
> 
> $  zenity --info --title="abc" --font "monospace 9" --text "abcdefg"
> This option is not available. Please see --help for all possible usages.
> 
> $ zenity --help-all | grep -i font
> <nothing>
> 
> $ rpm -qa \*zenity\*
> zenity-2.28.0-1.el6.x86_64
> 
> 
> I really need a monospaced font.  I am drawing a blank on Google.
> Any one know how to do this?
> 
> Many thanks,
> -T