Exhibit 3.105

Delaware	PAGE 1
The First State

     I, JEFFREY W. BULLOCK, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED ARE TRUE AND CORRECT COPIES OF ALL DOCUMENTS ON FILE OF “HILLSIDE HOSPITAL, LLC” AS RECEIVED AND FILED IN THIS OFFICE.

     THE FOLLOWING DOCUMENTS HAVE BEEN CERTIFIED:

     CERTIFICATE OF FORMATION, FILED THE TWELFTH DAY OF NOVEMBER, A.D. 1998, AT 9 O’CLOCK A.M.

     CERTIFICATE OF AMENDMENT, FILED THE TWENTY-SECOND DAY OF JANUARY, A.D. 2002, AT 10 O’CLOCK A.M.

     AND I DO HEREBY FURTHER CERTIFY THAT THE AFORESAID CERTIFICATES ARE THE ONLY CERTIFICATES ON RECORD OF THE AFORESAID LIMITED LIABILITY COMPANY, “HILLSIDE HOSPITAL, LLC”.

2965753     8100H		/s/ Jeffrey W. Bullock
110292314 You may verify this certificate online at corp. delaware.gov/authver.shtml		Jeffrey W. Bullock, Secretary of State AUTHENTICATION: 8619866 DATE: 03-14-11

STATE OF DELAWARE
SECRETARY OF STATE
DIVISION OF CORPORATIONS
FILED 09:00 AM 11/12/1998
981435255 — 2965753

CERTIFICATE OF FORMATION

OF

HILLSIDE HOSPITAL, LLC

Under Section 18-201 of the
Delaware Limited Liability Company Act

     FIRST: The name of the limited liability company is Hillside Hospital, LLC (the “Company”).

     SECOND: The address of the registered office of the Company in the State of Delaware is 1013 Centre hoed, Wilmington, Delaware 19805.

     THIRD: The name and address of the company’s registered agent for service of process is Corporation Service Company, 1013 Centre Road, Wilmington, Delaware 19805.

     IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation as of November 12, 1998.

By:	/s/ John M. Franck II
	Name:	John M. Franck II
	Title:	Authorized Person

CERTIFICATE OF AMENDMENT

OF

Hillside Hospital, LLC

     1. The name of the limited liability company is Hillside Hospital, LLC

     2. The Certificate of Formation of the limited liability company is hereby amended as follows:

The name and address of the registered agent is The Corporation Trust Company Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801.

     IN WITNESS WHEREOF, the undersigned has executed this Certificate of Amendment of Hillside Hospital, LLC this 15 day of January, 2002.

Hillside Hospital, LLC
 

/s/ William F. Carpenter III  

William F. Carpenter III,
Title Manager 

STATE OF DELAWARE
SECRETARY OF STATE
DIVISION OF CORPORATIONS
FILED 10:00 AM 01/22/2002
020041116 — 2965753