OSC Access Act This bill expands the authority of the Office of Special Counsel (OSC) by allowing it to: (1) have timely access to material available to an agency that relates to an investigation, review, or inquiry relating to whistle-blower allegations or prohibited personnel practices; (2) request from any agency the information or assistance that may be necessary for it to carry out its duties and responsibilities; and (3) require, during an investigation, review, or inquiry of an agency, the agency to provide it any record or other information related to an investigation, review, or inquiry. A claim of common law privilege by an agency, or an officer or employee of an agency, shall not prevent the OSC from obtaining any material from such agency.