Another Question submitted from our Question Form that we are happy to answer.
The short answer is, yes, almost always vinegar is vegan.
Vinegar comes in many varieties and is made by fermenting ethanol into aceyic acid. This starts with a plant base (grapes, apples, barley) which is then fermented or distilled into wine, beer or malt, and then further fermented to yield a vinegar. Vinegars can also be infused with fruits and herbs which enhance their flavor profiles.
The only animal based exception I found is honey vinegar, which would not be vegan as honey is used as the flavoring agent. However, honey vinegar is fairly rare, at least here in the US and will likely be labeled specifically.
Vinegars are a great way to add and enhance flavors of food without adding extra fats. A good balsamic vinegar is a great complement to many vegetable dishes and fruit vinegars make excellent companions for crisp leafy greens. White vinegar makes an excellent environmentally friendly cleaning agent for everything from the laundry to the kitchen sink.