Can I put a lock on my bedroom door in an apartment if I have roommates in Alberta?

That would be a question to take up with your landlord.

No law prevents it, ask the LL.

Yes. Tenants may not change exterior locks without permission of the landlord (and giving landlord a key).

That is something you need permission from your landlord

Put a chair up against the closed door, problem solved.

Update: Hey ace-hole you didn't mention that that in your question. Make your questions more concise and specific. That way you won't receive inappropriate answers and you won't waste my time .

What kind of lock? There are "travelers' locks" for temporarily jamming the door shut when you're inside and possibly even from the outside (when you're not home). Any permanent installation would probably cause "damage" and need permission of the landlord, who may also want a copy of a key, if it uses one. Of course, using any sort of lock on a bedroom door may require compliance with pertinent life-safety code and fire code.

Ask the landlord.

ask the landlord

No. Landlords need access in case you die inside or there's some emergency that needs fixing like a broken water pipe or window.

You have to ask your landlord that. You cannot change any hardware without landlord approval.

Its The first thing you do .