Is there a cable where you can link multiple fans and plug them into one header?

[Vindaloovians]

I'd like to add more fans to my case but I don't have enough fan headers...

 

[Deuce65]

Yes.

 

[Outlander_04]

most fans will have molex connectors and connect directly to the power supply

 

[WyomingKnott]

Yes. Some random examples:
2 3-pin fans from one header: http://www.newegg.com/Product/Product.aspx?Item=N82E16812200455
2 4-pin fans from one header: http://www.newegg.com/Product/Product.aspx?Item=N82E16812200991

If you don't care about fan speed control, you can feed fans power from a spare drive power connector, http://www.newegg.com/Product/Product.aspx?Item=N82E16812189119
Or, since you wrote "more fans," plural, something snazzy like this: http://www.newegg.com/Product/Product.aspx?Item=9SIA22918E5432 , a four-fan controller that sits in one of your front bays, gives you dials to control fan speed, and lights up.

For more specifics, how many fans, 3 or 4 pin, and do you care if they are speed-controlled by the motherboard?