This 1877 translation by Frederick Amadeus Malleson is considered the most faithful, though it has some slight rewrites.
Chapter I: The professor and his family
Chapter II: A mystery to be solved at any price
Chapter III: The runic writing exercises the professor
Chapter IV: The enemy to be starved into submission
Chapter V: Famine, then victory, followed by dismay
Chapter VI: Exciting discussions about an unparalleled enterprise
Chapter VII: A woman's courage
Chapter VIII: Serious preparations for vertical descent
Chapter IX: Iceland! but what next?
Chapter X: Interesting conversations with Icelandic savants
Chapter XI: A guide found to the centre of the earth
Chapter XII: A barren land
Chapter XIII: Hospitality under the arctic circle
Chapter XIV: But arctics can be inhospitable, too
Chapter XV: Snaefell at last
Chapter XVI: Boldly down the crater
Chapter XVII: Vertical descent
Chapter XVIII: The wonders of terrestrial depths
Chapter XIX: Geological studies in situ
Chapter XX: The first signs of distress
Chapter XXI: Compassion fuses the professor's heart
Chapter XXII: Total failure of water
Chapter XXIII: Water discovered
Chapter XXIV: Well said, old mole! canst thou work i' the ground so fast?
Chapter XXV: De profundis
Chapter XXVI: The worst peril of all
Chapter XXVII: Lost in the bowels of the earth
Chapter XXVIII: The rescue in the whispering gallery
Chapter XXIX: Thalatta! thalatta!
Chapter XXX: A new mare internum
Chapter XXXI: Preparations for a voyage of discovery
Chapter XXXII: Wonders of the deep
Chapter XXXIII: A battle of monsters
Chapter XXXIV: The great geyser
Chapter XXXV: An electric storm
Chapter XXXVI: Calm philosophic discussions
Chapter XXXVII: The Liedenbrock Museum of Geology
Chapter XXXVIII: The professor in his chair again
Chapter XXXIX: Forest scenery illuminated by eletricity
Chapter XL: Preparations for blasting a passage to the centre of the earth
Chapter XLI: The great explosion and the rush down below
Chapter XLII: Headlong speed upward through the horrors of darkness
Chapter XLIII: Shot out of a volcano at last!
Chapter XLIV: Sunny lands in the blue mediterranean
Chapter XLV: All's well that ends well
This work was published before January 1, 1923, and is in the public domain worldwide because the author died at least 100 years ago.