Can a landlord enter a room without permission? (Connecticut)?

How formal is the rental agreement? Renting from his parents might be more like he's living at home, and helping with expenses. If that's the case, then it's basically their house, and they can do what they want. If you move out and get your own place, there will be formal rules for when the landlord can enter your apartment, but they will still be able to, without your permission. Depending on local laws, they may need to give you advanced notice for maintenance and routine inspections. In the event of an emergency (i.e., burning smell...) or to comply with legal orders (i.e. police with probable cause or a warrant), no warning is required.

Your boyfriend is living with his parents. Do not get confused into thinking this is some sort of landlord/tenant relationship. It's not. It's a parent/child relationship.

If the two of you want more privacy, you'll need to move out and find a place where you would have a landlord/tenant relationship.

Of course they can. If you don't like it, move out, into your own place, where you will have the privacy and independence you seem to want.

If your renting then put a lock on your room.

This is completly illegal, if your rent is up to date that room is considered yours.Get a bolt put on the door so that nobody can enter while you are not dressed, and tell them they have to have permission by you to enter, if you are not there they should wait until you are in to come into your room, but only with your permission.It may be time to look for your own place.

My boyfriend and I rent a room from his parents.
DEAD WRONG. You live with your boyfriend in his parent's home. They ALLOW you to use one of THEIR bedrooms and contribute to the household expenses.
Unless you can provide a WRITTEN contract to the contrary, which you KNOW doesn't exist, the court will agree with me.

No, they must provide notice per state law, since you pay rent.

If the room is legally rentable per local zoning laws, and you have a written formal rental agreement, then no.

If you are chipping in and staying in a room in their house, you are not renting, you are staying with his family. Big legal difference. The room is just part of their house.

LMAO! WTF do you expect when you shack up wit da bf at his parents house? Grow the fvck up and move out. You live with mommy. Nothing more.

This doesn't sound like a formal landlord/tenant situation. Did you sign a lease?