Oxford University-educated Tolkien was the author's third and youngest son, and was responsible for editing much of his father's work after his death in 1973.
Born in Leeds, U.K., on November 21, 1924, Christopher Tolkien became one of the earliest audience members for The Hobbit as a child.
According to science fiction and fantasy book website TOR.com, Christopher was his father's intended audience for his famous work, The Hobbit.
He had a son, novelist and former lawyer Simon, by his first marriage, and two children, Adam and Rachel, with his second wife Baillie, with whom he lived in France since the 1970s.
The renowned author and editor's passing was announced on Thursday by the Tolkien Society, one of many institutions established in his father's honor.
Mark Ordesky, producer on The Lord of the Rings movies, expressed his condolences on social media, tweeting, "An age of Middle-earth has ended".
He also took issue with Peter Jackson's critically acclaimed Lord of the Rings adaptation, telling French newspaper Le Monde in 2012 that the book had been "gutted" to make "an action film for 15 to 25-year-olds". He edited and published such monumental works as The Silmarillion, The Unfinished Tales, The Book of Lost Tales, The History of Middle-earth and, in recent years, the individually released tales of The Children of Hurin, Beren and Luthien, and The Fall of Gondolin.
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Christopher Tolkien at Keble College in Oxford in 1992.
He drew numerous original maps detailing the world of Middle Earth for his father's The Lord of the Rings when the series was first published between 1954 and 55.
"Rest in peace, First Scholar of JRR Tolkien's Legendarium, a man who grew up in Middle Earth." .
'As odd as it may seem, I grew up in the world he created, ' Tolkien said in 2012, 'For me, the cities of The Silmarillion are more real than Babylon'.
"Christopher's commitment to his father's works have seen dozens of publications released, and his own work as an academic in Oxford demonstrates his ability and skill as a scholar", he said.
He also said: "Tolkien has become a monster, devoured by his own popularity and absorbed by the absurdity of our time", and that "the commercialisation has reduced the aesthetic and philosophical impact of the creation to nothing".
"It is with great sadness that we can confirm that Tolkien's son and literary executor Christopher Tolkien has died aged 95", the statement said.