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The first peace treaty of the conflict. It was agreed between Russia - which had sided with the Allies, and Germany and other members of its Central Powers coalition.
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Signed in the Hall of Mirrors at the Palace of Versailles outside Paris exactly five years after the assassination of Archduke Franz Ferdinand that sparked the war. This treaty designated Germany responsible for losses and damages from the war.
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This treaty established peace between the Allies and defeated Austria, and consecrated the dismantlement of the Austro-Hungarian empire into several smaller states. A source of many future tensions.
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Allied powers signed this treaty with Bulgaria, which had joined forces with Germany in 1915, in the Paris suburb of Neuilly.
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The Treaty of Trianon was concluded at Versailles between the Allies and Hungary, which lost two-thirds of the land it controlled as part of the Austria-Hungarian empire.
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Treaties signed with Turkey led to the dissolution of the once-mighty Ottoman Empire and defined most of the borders of modern-day Turkey. (I couldn't find a date of when this took place, but around August 10th)