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A squeaky door in your home is most often caused by dirty hinges. You could replace the hinges for around $15 per door, or spend around $10 and fix all the doors in your house.

Hinges squeak when there is friction between either the half of the hinge attached to the door and the half attached to the door jam, or between the hinge and the hinge pin. This instructable will only address the latter issue. If the hinge halves are rubbing against each other, it's probably because the top and bottom hinges aren't aligned and you probably are having much bigger problems with your door than just squeaking, like not closing properly. 

Step 1: Tools

Picture of Tools
The tool list is pretty short. You will need:

Hammer
Flathead Screwdriver
Steel Wool
Paper Towels
Lubricant


 
crlsbrrds3 years ago
Instead of oil/grease, you may also use parafin as lubricant; just rub the parafin on the pin...
And if the wooden door or doorframe are a bit offline and rub on each other, parafin will reduce the friction.
Gun oil also works very good.
I've never done it like this - I always cover them in WD40. :P But this seems like a much nicer long term solution. Good tips, too!