+ The duly authorized agent of such author, other copyright
    claimant, or owner of exclusive right(s).  Any person authorized to
    act on behalf of the author, other copyright claimant, or owner of
    exclusive rights may apply for registration.

There is no requirement that applications be prepared or filed by an attorney.

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APPLICATION FORMS

For Original Registration

Form PA [http://www.loc.gov/copyright/forms/formpai.pdf]
  for published and unpublished works of the performing arts (musical
  and dramatic works, pantomimes and choreographic works, motion
  pictures and other audiovisual works)

Form SE [http://www.loc.gov/copyright/forms/formsei.pdf]

for serials, works issued or intended to be issued in successive parts bearing numerical or chronological designations and intended to be continued indefinitely (periodicals, newspapers, magazines, newsletters, annuals, journals, etc.)

Form SR [http://www.loc.gov/copyright/forms/formsri.pdf]

  for published and unpublished sound recordings

Form TX [http://www.loc.gov/copyright/forms/formtxi.pdf]

  for published and unpublished nondramatic literary works

Form VA [http://www.loc.gov/copyright/forms/formvai.pdf]

  for published and unpublished works of the visual arts (pictorial,
  graphic, and sculptural works, including architectural works)

Form G/DN [http://www.loc.gov/copyright/forms/formgdn.pdf]

  a specialized form to register a complete month’s issues of a daily
  newspaper when certain conditions are met

Short Form SE [http://www.loc.gov/copyright/forms/formses.pdf], and
Short Form SE Group [http://www.loc.gov/copyright/forms/formseg.pdf]

  specialized SE forms for use when certain requirements are met

Short Form TX [http://www.loc.gov/copyright/forms/formtxs.pdf], Short Form PA [http://www.loc.gov/copyright/forms/formpas.pdf], and Short Form VA [http://www.loc.gov/copyright/forms/formvas.pdf]

  short versions of applications for original registration.  For further
  information about using the short forms, request publication SL-7.

Form GATT [http://www.loc.gov/copyright/forms/formgatt.pdf], and Form GATT/GRP [http://www.loc.gov/copyright/forms/formgatg.pdf]

specialized forms to register a claim in a work or group of related works in which U. S. copyright was restored under the 1994 Uruguay Round Agreements Act (URAA).  For further information, request Circular 38b [http://www.loc.gov/copyright/circs/cir
c38b.pdf].

*** For Renewal Registration

Form RE [http://www.loc.gov/copyright/forms/formrei.pdf]