What liquor has 0 calories?

Straight gin has no sugar or carbs, but the mixers in popular drinks (such as a Gin and tonic) do.

Straight Vodka will have no sugar, flavored Vodka would.

Whether American, Canadian, Scotch, or Irish, Whiskey will never have any carbs or sugar included.

The answers above have mis-understood the question. It does not ask about added carbs or sugar, only about "kinds of alcohol" and calories.

• All alcohols have a calorific value
• The alcohol in drinks is ethanol
• Pure ethanol is very calorific; that is why it is put into gasoline
• The calorific value of alcoholic drinks depends mostly on the percentage of ethanol in them. No additive can reduce the calorific value below what comes from the ethanol content - it can only increase it.
• The alcohol with the lowest calorie content per pint is methanol; this is not put into drinks because it is poisonous.