The simple answer is yes and no.
Yes, gin is a depressant. No, because is doesn’t actually cause depression.
The fact is alcohol is the depressant but it doesn’t cause depression. If you are depressed then drinking lots of alcohol is unlikely to help but gin will not make you feel any more or less depressed than drinking vodka or whisky.
It’s a myth and one almost certainly started during the time when people in the UK drank far too much gin, to the point when it had a negative impact on their life. During the late 18th and early 19th century gin was responsible for increases in crime, neglect and general bad behavior, but on a huge scale. It is therefore no wonder that it was blamed for all that negativity and that is the myth that has endured.
That being said, the fact is gin does not make you depressed and in our experience is certainly not a depressing drink!