I wrote to Hidden Valley to make certain which of their mixes are vegan. I posted a recipe a few days ago with this mix as part of the recipe. Take a tub of Tofutti Better than Sour Cream and add a pack of Hidden Valley Mix for dip or thin it down with soy milk for Ranch Dressing, it's really good either way.
Here's the reply from Hidden Valley:
May 23, 2006
Reference Number: 4500928
Thank you for contacting us about HV Dips Mix - Fat Free Original Ranch.
We always appreciate hearing from our consumers.
The Dip Mixes are vegan. If you have any further questions, concerns, or comments please do not hesitate to contact us.
Again, thank you for contacting us.
Consumer Response Representative