Pale Fire is a 1962 novel by Vladimir Nabokov. The novel is presented as a 999-line poem titled "Pale Fire", written by the fictional poet John Shade, with a foreword, lengthy commentary, and index written by Shade's neighbor and academic colleague, Charles Kinbote. Together these elements form a narrative in which both fictional authors are central characters. Nabokov wrote Pale Fire in 1960–61, after the success of Lolita had made him financially independent, allowing him to retire from teaching and return to Europe. Nabokov began writing the novel in Nice and completed it in Montreux, Switzerland.

While Lolita remains his most famous work, many critics and scholars frequently cite Pale Fire as Vladimir Nabokov's magnum opus. The Nabokov authority Brian Boyd has called it "Nabokov's most perfect novel", and the critic Harold Bloom called it "the surest demonstration of his own genius ... that remarkable tour de force". The novel's unusual structure has attracted much attention, and it is often cited as an important example of metafiction, as well as an analog precursor to hypertext fiction, and a poioumenon. It has spawned a wide variety of interpretations and a large body of written criticism, which literary scholar Pekka Tammi estimated in 1995 as more than 80 studies.

Starting with the epigraph and table of contents, Pale Fire is apparently the publication of a 999-line poem in four cantos ("Pale Fire") by the fictional John Shade with a foreword, extensive commentary, and index by his self-appointed editor, Charles Kinbote. Kinbote's commentary takes the form of notes to various numbered lines of the poem. Here, as in the rest of his critical apparatus, Kinbote explicates the poem very little. Focusing monomanically on his own concerns, he divulges what proves to be the plot piece by piece, some of which can be connected by following the many cross-references. Espen Aarseth noted that Pale Fire "can be read either unicursally, straight through, or multicursally, jumping between the comments and the poem." Thus, although the narration is non-linear and multidimensional, the reader can still choose to read the novel in a linear manner without risking misinterpretation.

The interaction between Kinbote and Shade takes place in the fictitious small college town and state of New Wye, Appalachia, where they live across a lane from each other from February to July 1959. Kinbote writes his commentary from then to October 1959 in a tourist cabin in the equally fictitious western town and state of Cedarn, Utana. Both authors recount many earlier events, Shade mostly in New Wye and Kinbote in New Wye and in Europe, especially the "distant northern land" of Zembla.

Shade's poem digressively describes many aspects of his life. Canto 1 includes his early encounters with death and glimpses of what he takes to be the supernatural. Canto 2 is about his family and the apparent suicide of his daughter, Hazel Shade. Canto 3 focuses on Shade's search for knowledge about an afterlife, culminating in a "faint hope" in higher powers "playing a game of worlds" as indicated by apparent coincidences. Canto 4 offers details on Shade's daily life and creative process, as well as thoughts on his poetry, which he finds to be a means of somehow understanding the universe.

In Kinbote's editorial contributions he tells three stories intermixed with each other. One is his own story, notably including what he thinks of as his friendship with Shade. After Shade was murdered, Kinbote acquired the manuscript, including some variants, and has taken it upon himself to oversee the poem's publication, telling readers that it lacks only line 1000. Kinbote's second story deals with King Charles II, "The Beloved", the deposed king of Zembla. King Charles escaped imprisonment by Soviet-backed revolutionaries, making use of a secret passage and brave adherents in disguise. Kinbote repeatedly claims that he inspired Shade to write the poem by recounting King Charles's escape to him and that possible allusions to the king, and to Zembla, appear in Shade's poem, especially in rejected drafts. However, no explicit reference to King Charles is to be found in the poem. Kinbote's third story is that of Gradus, an assassin dispatched by the new rulers of Zembla to kill the exiled King Charles. Gradus makes his way from Zembla through Europe and America to New Wye, suffering comic mishaps. In the last note, to the missing line 1000, Kinbote narrates how Gradus killed Shade by mistake.

Towards the end of the narrative, Kinbote all but states that he is in fact the exiled King Charles, living incognito; however, enough details throughout the story, as well as direct statements of ambiguous sincerity by Kinbote towards the novel's end, suggest that King Charles and Zembla are both fictitious. In the latter interpretation, Kinbote is delusional and has built an elaborate picture of Zembla complete with samples of a constructed language as a by-product of insanity; similarly, Gradus was simply an unhinged man trying to kill Shade, and his backstory as a revolutionary assassin is also made up.

In an interview, Nabokov later said that Kinbote killed himself after finishing the book. The critic Michael Wood has stated, "This is authorial trespassing, and we don't have to pay attention to it", but Brian Boyd has argued that internal evidence points to Kinbote's suicide. One of Kinbote's annotations to Shade's poem (corresponding to line 493) addresses the subject of suicide at some length.