In typography and word processing, a page header (or simply header) is text that is separated from the body text and appears at the top of a printed page. Word-processing programs usually allow for the configuration of page headers, which are typically identical throughout a work except in aspects such as page numbers.
The counterpart at the bottom of the page is called a page footer (or simply footer); its content is typically similar and often complementary to that of the page header.
In publishing and certain types of academic writing, a running head, less often called a running header, running headline or running title, is a header that appears on each standard page.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Running heads do not usually appear on display pages such as title pages, or on other front or back matter.<ref>Template:Cite news</ref> Running heads in a book typically consist of the title on the left-hand (verso) page, and the chapter title on the right-hand (recto) page; or the chapter title on the verso and subsection title/subhead on the recto, aiding the reader's navigation by showing what content exists within the two-page spread at hand.
A special case of the latter is in dictionaries, whose running heads are called guide words; they show the first headword and last headword on each page, to expedite the reader's navigation to a desired headword. In academic writing, the running head usually contains the page number along with the author's last name,<ref>Template:Cite book</ref> or an abbreviated version of the title.<ref>Template:Cite book</ref> The counterpart of the running head is the running foot.
- Živé záhlaví.jpg
Header with highlighted current chapter title
- Knižní záhlaví.jpg
Header with the author's name and pagination
- Záhlaví na straně.jpg
Header placed on the left hand side of page
- Sadhupratikramanasutra.png
Header placed on the left hand side of page, pothi format
- Záhlaví sloužící jako orientační systém v knize 365 typo 2..jpg
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