Systems and methods for market order volume clearing in online trading of credit derivatives are disclosed. In one embodiment, a method for market order volume clearing may comprise: selecting, from a plurality of credit derivatives, at least one most liquid credit derivative; determining a volume clearing price level for the selected credit derivative; inviting trading clients of the electronic trading system to submit, within a time limit, buy orders and sell orders for the selected credit derivative at the volume clearing price level, each buy order or sell order specifying a desired volume; matching the buy orders and the sell orders submitted within the time limit to maximize a total notional amount of the selected credit derivative that can be traded at the volume clearing price level; and completing trades at the volume clearing price level according to the matching of orders.