- Trimorphism
- Trimurti
- Trincomalee
- Trine, Ralph Waldo
- Trinidad (city)
- Trinidad (island)
- Trinitarians
- Trinitrotoluenes
- Trinity
- Trinity Bay
- Trinity College (Hartford)
- Trinity College (Durham)
- Trinity College (Cambridge)
- Trinity College (Oxford)
- Trinity College (Dublin)
- Trinity House
- Trinity River
- Tucson
- Tulip Tree
- Tulle
- Tullius, Servius
- Tulloch, John
- Tullus Hostilius
- Tulsa City
- Tumor
- Tumulty, Joseph Patrick
- Tunbridge
- Tungsten
- Tungstite
- Tunic
- Tuning
- Tuning Fork
- Tunis (protectorate)
- Tunis (city)
- Tunnel
- Tunny
- Tunstall, Cuthbert
- Tupelo
- Tupper, Sir Charles
- Tupper, Martin Farquhar
- Tura
- Turanian
- Turbellaria
- Turbine
- Turbot
- Turco-Italian War
- Turenne, Henri . . ., Vicomte de
- Twachtman, John Henry
- Tweed (river)
- Tweed (cloth)
- Tweed, William Marcy
- Twelve Tables
- Twilight
- Twilight Sleep
- Twin-spotted Quaker
- Tyler, John
- United Provinces of Agra and Oudh
- United States of America
- United States Christian Commission
- United States Coast Survey
- Utah
- Utah, University of
- Utahs
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- Van Buren, Martin
- Vermont
- Vermont, University of
- Verne, Jules
- Viceroy
- Vichy
- Vicksburg
- Victor Amadeus I.
- Victor Amadeus II.
- Victor Amadeus III.
- Victor Emmanuel I.
- Villard, Henry
- Villard, Oswald Garrison
- Virchow, Rudolf
- Virginal
- Virginia
- Virginia (Minnesota)
- Virginia (daughter)
- Virginia, University of
- Virginia City
- Virginia Creeper
- Virginia Military Institute
- Virginian Deer
- Virginian Eared Owl
- Virginian Opossum
- Virginian Quail
- Virgin Islands
- Vos, Bert John
- Vosges
- Vosges Mountains
- Voss, Gerhard Johann
- Voss, Johann Heinrich
- Voss, Julius von
- Voss, Richard
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- Wait
- Waite, Morrison Remich
- Walrus
- Waltham
- Walther von der Vogelweide
- Washburn, George
- Washburn College
- Washburne, Elihu Benjamin
- Washington (State)
- Washington (District of Columbia)
- Washington (Indiana)
- Washington (Pennsylvania)
- Washington, University of
- Washington, Booker Taliaferro
- Washington, Bushrod
- Washington, George
- Washington, Fort
- Washington, Treaty of
- Washington and Jefferson College
- West Park
- Westphalia
- Westphalia, Peace of
- West Point
- West Springfield
- West Tampa
- West Virginia
- West Virginia University
- Westward Ho
- Wetmore, George Peabody
- Wetter
- Wetterhorn
- Wetzlar
- Wexford
- Wheaton, Henry
- Wheaton, Lloyd
- Wheaton College
- Wheeling
- White, Andrew Dickson
- White, Edward Douglas
- White, Gilbert
- White, Henry
- White, Henry Kirke
- White, Horace
- White, Richard Grant
- White, Stewart Edward
- White, William Allen
- White Sea
- Whiting
- Whiting, Lilian
- Whitlock, Brand
- Whitman, Charles Seymour
- Whitman, Marcus
- Whitman, Sarah Helen Power
- Whitman, Walt
- Whitman College
- Whitney, Adeline Dutton (Train)
- Whitney, Eli
- Whitney, Josiah Dwight
- Whitney, William Collins
- Whitney, William Dwight
- Whitney, Mount
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- Wieland, Christoph Martin
- Wilmerding
- Wilmington (Delaware)
- Wilmington (North Carolina)
- Wilson, James Grant
- Wilson, Thomas Woodrow
- Winsor, Justin
- Wireless Telegraphy and Telephony
- Wirt, William
- Wisby
- Wisconsin
- Wisconsin River
- Wisconsin, University of
- Wisdom of Solomon, The
- Wise, Henry Alexander
- Wise, Henry Augustus
- Wise, Isaac Mayer
- Wiseman, Nicholas Patrick
- Wise Men of the East
- Wismar
- Wissembourg
- Wistar, Caspar
- Wistaria
- Wister, Owen
- Woman suffrage
- Woolley, Mary Emma
- Woonsocket
- Woorali Poison
- Wooster
- Wooster University
- Worcester (Massachusetts)
- World War
- Wycombe
- Wye
- Wyman, Walter
- Wyndham, Sir Charles
- Wyoming
- Wyoming, University of
- Wyoming Valley
- Wythe, George
- Wyttenbach, Daniel
- Yankton
- Yankton College
- Year
- Yeast
- Yeats, William Butler
- Yell
- Yellow Fever
- Yule, Sir Henry
- Yung Wing
- Zenobia
- Zerrahn, Carl
- Zouave
- Zrinyi, Count Niklas
- Zschokke, Johann Heinrich Daniel
- Zueblin, Charles
- Zwingli, Ulric
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