I am trying to determine if my 2011 Mitsubishi Endeavor is an LS or SE, it isn't listed on the registeration papers.

Did you look on the back of the vehicle? Sometimes there are little chrome badges that say on the back of the vehicle.

Thank you, I looked on the back and the inside of the doors but there is nothing.

Post your VIN number and you can leave off the last 4 digits for security and I will look it up for you.