QUOTE
If you have a Bitcoin (BTC) balance on Bittrex during the BTG snapshot block 491,407 occurring approximately on October 24, 3am PT (10am UTC), you will be additionally credited the equivalent amount of Bitcoin Gold (BTG) on a 1:1 basis. i.e. 1 BTC on Bittrex held during the on-exchange snapshot will get you 1 BTG. BTC held on orders will also be credited. Only the BTC held on your account is eligible for BTG.
Full Details Here ===> https://support.bittrex.com/hc/en-us/articles/115002320451-Statement-on-Bitcoin-Gold-BTG-
More Exchanges say "YES".....
GMOCoin
BitPoint
CoinCheck
BitFlyer
HitBTC will honor both Bitcoin Gold and SegWit2x