From what source?
If it's directly on a voltage source like a CMOS output pin, it's not going to appreciate the low impedance (~short circuit) at high frequencies of the pi filter.
And since inductors are generally more bothersome than capacitors, you might as well go for an extra pole (4th order) LCLC.
If the load is say 50 ohms all the time, all you need is a filter designed for source and load respectively (the source will be fairly resistive if CMOS logic, but if it's substantially lower than 50 ohms (say from a gate drive IC?), consider either ballasting it up with a series resistor, or using a one-port-shorted type filter -- such types are found in more complete tables [1][2]. Or if it's current-sourced, a one-port-open (shunt C input) type will be needed.
[1] Electronic Filter Design Handbook, 4th Ed., Williams and Taylor
[2] Handbook of Filter Synthesis, Zverev
If the load is not a constant resistance in general (e.g. sometimes poorly terminated cable?), consider using an internal filter, then a buffer amp. This would be the way to go for a signal generator, for example.
Tim