Hi,
First you need to know what "noise" means in your case.
Then you need to decide your filter characteristic.
--> show us these/your filter requirements.
After that you may decide filter topology.
There are different topologies:
A simple internet research may have showed you them. Like FIR, IIR, Biquad.... and others.
--> So may I ask what you have done so far?
******
Btw: It's better to avoid this noise, than to cure it.
I recommend to show us
* what your signal source is
* your analog signal conditioning circuit
* your ADC with all the informations like: power supply, refence voltage, sampling rate and so on
* informations about the "noise" you talk of
Klaus