- Richmond, Sir William Blake
- Richter, Hans
- Ricketts, Charles
- Ricotti-Magnani, Cesare
- Riddell, George Allardice Ridell, 1st Baron
- Ridgeway, Sir William
- Rifles and Light Machine-Guns
- Righi, Augusto
- Riley, James Whitcomb
- Rio de Janeiro
- Rio de Oro
- Risley, Sir Herbert Hope
- Ritchie, Anne Isabella, Lady
- Rivière, Briton
- Rivington, Francis Hansard
- Rivoira, Giovanni Teresio
- Robert-Fleury, Tony
- Roberts, Frederick Sleigh Roberts, Earl
- Roberts, George Henry
- Roberts, John
- Robertson, Sir George Scott
- Robertson, Sir William Robert
- Robins, Elizabeth
- Robinson, Edwin Arlington
- Robson, William Snowdon Robson, Baron
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- Roby, Henry John
- Rochefort, Henri
- Rockefeller, John Davison
- Rodin, François Auguste
- Rodzianko, Michael Vassilievich
- Rogers, Benjamin Bickley
- Rogers, James Guinness
- Rolland, Romain
- Romer, Sir Robert
- Ronald, Sir Landon
- Roosevelt, Franklin Delano
- Roosevelt, Theodore
- Root, Elihu
- Roscoe, Sir Henry Enfield
- Rosebery, Archibald Philip Primrose, 5th Earl of
- Rosegger, Peter
- Rosenthal, Toby Edward
- Rosenwald, Julius
- Ross, Sir George william
- Ross, Robert Baldwin
- Ross, Sir Ronald
- Rostand, Edmond
- Rosyth
- Rothenstein, William
- Rothermere, Harold Sidney Harmsworth, 1st Visct.
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- Rothschild, Nathaniel Mayer, 1st Baron
- Round, John Horace
- Rouvier, Maurice
- Rovno, Battle of
- Rowell, Newton Wesley
- Rowing
- Royce, Josiah
- Royden, Agnes Maude
- Rubber
- Rücker, Sir Arthur
- Ruffey, Pierre Xavier Emmanuel
- Rumania
- Runciman, Walter
- Rupprecht
- Russell, Bertrand Arthur William
- Russell, George William
- Russell, Israel Cook
- Russell, Sir Thomas Wallace
- Russell, William Clark
- Russia
- Russky, Nikolai
- Rutherford, Sir Ernest
- Rutherford, Mark
- Ryan, John Denis
- Ryder, Albert Pinkham
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- Saar Valley
- Sabine, Wallace Clement Ware
- Sage, Mrs. Russell
- Said, Halim, Prince
- Said Pasha
- St. Aldwyn, Micha Edward Hicks Beach, 1st Earl
- St. John, Florence
- St. Louis
- St. Mihiel, Battle of
- St. Pierre and Miquelon
- Saint-Saëms, Charles Camille
- Saintsbury, George Edward Bateman
- Saionji, Kimmochi, Prince
- Sakhalin
- Salandra, Antonio
- Salisbury, James Edward Hubert Gascoyne-Cecil, 4th Marquess of
- Salonika Campaigns
- Salting, George
- Salvador
- Salvini, Tommaso
- Salzburg
- Samsonov, Alexander
- Samuel, Sir Herbert Louis
- Sanday, William
- San Francisco
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