| Engels to the Liebknecht family. 1 January |
| Engels to Friedrich Adolph Sorge. 6 January |
| Engels to Laura Lafargue. 6 January |
| Engels to Laura Lafargue. 20 January |
| Engels to Karl Kautsky. 26 January |
| Engels to Karl Kautsky. 28 January |
| Engels to Florence Kelley-Wischnewetzky. 28 January |
| Engels to Hermann Engels. 28 January |
| Engels to Hermann Engels. 29 January |
| Engels to Karl Kautsky. 1 February |
| Engels to August Bebel. 2 February |
| Engels to Laura Lafargue. 3 February |
| Engels to Conrad Schmidt. 4 February |
| Engels to Hermann Engels. 4 February |
| Engels to Filippo Turati. 6 February |
| Engels to Stanislaw Mendelson. 11 February |
| Engels to Filippo Turati. 13 February |
| Engels to Edward Aveling. First half of February |
| Engels to Hermann Engels. 17 February |
| Engels to Victor Adler. 19 February |
| Engels to August Bebel. 19 February |
| Engels to Laura Lafargue. 5 March |
| Engels to Karl Kautsky. 5 March |
| Engels to Friedrich Adolph Sorge. 5 March |
| Engels to August Bebel. 8 March |
| Engels to Julie Bebel. 8 March |
| Engels to Laura Lafargue. 14 March |
| Engels to Nikolai Danielson. 15 March |
| Engels to August Bebel. 16 March |
| Engels to Filippo Turati. 18 March |
| Engels to Karl Kautsky. 30 March |
| Engels to Pasquale Martignetti. 30 March |
| Engels to Hermann Schlüter. 30 March |
| Engels to Laura Lafargue. 4 April |
| Engels to Henri Brissac. After 7 April |
| Engels to August Bebel. 16 April |
| Engels to Laura Lafargue. 19 April |
| Engels to Karl Kautsky. 20 April |
| Engels to Pasquale Martignetti. 21 April |
| Engels to Johann Heinrich Wilhelm Dietz. 23 April |
| Engels to Johann Heinrich Wilhelm Dietz. 23 April |
| Engels to Johann Heinrich Wilhelm Dietz. 27 April |
| Engels to Nikolai Petersen. 3 May |
| Engels to Johann Heinrich Wilhelm Dietz. 5 May |
| Engels to Laura Lafargue. 5 May |
| Engels to August Bebel. 7 May |
| Engels to Johann Heinrich Wilhelm Dietz. 12 May |
| Engels to Stanislaw Mendelson. 14 May |
| Engels to Karl Kautsky. 17 May |
| Engels to Ludwig Schorlemmer. 17 May |
| Engels to Victor Adler. 19 May |
| Engels to Paul Lafargue. 19 May |
| Engels to Ludwig Schorlemmer. 19 May |
| Engels to Paul and Laura Lafargue. 27 May |
| Engels to August Siegel. 28 May |
| Engels to Sir Henry Enfield Roscoe. 28 May |
| Engels to Ludwig Schorlemmer. 28 May |
| Engels to Ludwig Schorlemmer. 5 June |
| Engels to Laura Lafargue. 9 ]une |
| Engels to Karl Kautsky. 11 June |
| Engels to Ludwig Schorlemmer. 16 June |
| Engels to Nikolai Danielson. 18 June |
| Engels to Friedrich Adolph Sorge. 18 June |
| Engels to August Bebel. 20 June |
| Engels to Karl Kautsky. 25 June |
| Engels to Kari Kautsky. 27 June |
| Engels to Ludwig Schorlemmer. 30 June |
| Engels to Ludwig Schortemmer. 1 June |
| Engels to Stanislaw Mendelson. 4 July |
| Engels to August Bebel. 5 July |
| Engels to Karl Kautsky. 5 July |
| Engels to August Bebel. 6 July |
| Engels to John Burns. 6 July |
| Engels to August Bebel. 7 July |
| Engels to Laura Lafargue. 7 July |
| Engels to Panayottis Argyriades. Beginning of July |
| Engels to Hermann Engels. 12 July |
| Engels to Eduard Bernstein. 14 July |
| Engels to Paul Lafargue. 22 July |
| Engels to August Bebel. 23,yuly |
| Engels to Regina Bernstein. 25 July |
| Engels to Pasquale Martignetti. 25 July |
| Engels to Ludwig Schorlemmer. 25 July |
| Engels to Laura Lafargue. 26 July |
| Engels to Ludwig Schorlemmer. 28 July |
| Engels to Hermann Engels. 28 July |
| Engels to August Bebel. 8 August |
| Engels to Hermann Engels. 8 August |
| Engels to Karl Kautsky. 12 August |
| Engels to August Bebel. 14 August |
| Engels to Regina Bernstein. 15 August |
| Engels to Victor Adler. 19 August |
| Engels to August Bebel. 20 August |
| Engels to Laura Lafargue. 22 August |
| Engels to Pasquale Martignetti. 22 August |
| Engels to Friedrich Adolph Sorge. 23 August |
| Engels to August Bebel. 25 August |
| Engels to Victor Adler. 30 August |
| Engels to Karl Kautsky. 4 September |
| Engels to Karl Kautsky. 5 September |
| Engels to Ludwig Kugelmann. 5 September |
| Engels to Laura Lafargue. 11 September |
| Engels to August Bebel. 11 September |
| Engels to Conrad Schmidt. 12 September |
| Engels to Karl Kautsky. 16 September |
| Engels to Regina and Eduard Bernstein. 17 September |
| Engels to Paul Lafargue. 17 September |
| Engels to Nikolai Danielson. 22 September |
| Engels to Victor Adler. 25 September |
| Engels to Karl Kautsky. 26 September |
| Engels to August Bebel. 26 September |
| Engels to Victor Adler. 27 September |
| Engels to Franz Mehring. 28 September |
| Engels to Karl Kautsky. 29 September |
| Engels to August Bebel 7 October |
| Engels to Ludwig Kugelman 10 October |
| Engels to Laura Lafargue 14 October |
| Engels to Pasquale Martignetti 18 October |
| Engels to Ludwig Schorlemmer 18 October |
| Engels to Charles Bonnier mid-October |
| Engels to Victor Adler 23 October |
| Engels to Charles Bonnier 24 October |
| Engels to Paul Lafargue 3 November |
| Engels to Laura Lafargue 4 November |
| Engels to Friedrich Adolph Sorge 5 November |
| Engels to Sergei Kravchinsky (Stepniak) 5 November |
| Engels to August Bebel 6 November |
| Engels to Paul Lafargue 12 November |
| Engels to August Bebel 15 November |
| Engels to Sergei Kravchinsky 15 November |
| Engels to August Bebel 19 November |
| Engels to Paul Lafargue 22 November |
| Engels to Julie Bebel 29 November |
| Engels to August Bebel 29 November |
| Engels to An Unknown Correspondent 29 November |
| Engels to The SPD Secretariat 29 November |
| Engels to Paul Stumpf 30 November |
| Engels to Natalie and Wilhelm Liebknecht 1 December |
| Engels to Ludwig Schorlemmer 1 December |
| Engels to Charles Bonnier 3 December |
| Engels to August Bebel 3 December |
| Engels to Karl Kautsky 4 December |
| Engels to Paul Lafargue 5 December |
| Engels to Laura Lafargue 5 December |
| Engels to Mrs Stepniak (Kravchinsky) 6 December |
| Engels to Wilhelm Ellenbogen 7 December |
| Engels to Pyotr Lavrov 14 December |
| Engels to Laura Lafargue 20 December |
| Engels to August Bebel 22 December |
| Engels to Karl Kautsky 24 December |
| Engels to Wilhelm Liebknecht 28 December |
| Engels to Friedrich Adolph Sorge 31 December |
| Engels to Karl Henckell end of 1892 |