- Hadley, John
- Hale, Alan
- Hale, George Ellery
- Hall, Asaph
- Halley, Edmond
- Hamilton, William Rowan
- Hamy, Maurice
- Hansen, Peter Andreas
- Hansteen, Christopher
- Harding, Karl Ludwig
- Haro, Guillermo
- Harrington, Robert G.
- Harrington, Robert Sutton
- Harriot, Thomas
- Hartmann, Juan
- Hawking, Stephen
- Hayakawa, Shūji
- Heckmann, Otto
- Helffrich, Joseph
- Helin, Eleanor F.
- Hencke, Karl Ludwig
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- Heng, Zhang
- Henry, Paul-Pierre
- Henry, Prosper-Mathieu
- Héraclite du Pont
- Herbig, George
- Herman, Robert
- Herschel, Caroline
- Herschel, John
- Herschel, William
- Hertzsprung, Ejnar
- Hess, Victor
- Hevelius, Johannes
- Hewish, Antony
- Hill, George William
- Hind, John Russell
- Hioki, Tsutomu
- Hipparque
- Hirasawa, Masanori
- Hirayama, Kiyotsugu
- Hochberg, David
- Hodges, Ann
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- Hodierna, Giovanni Battista
- Hoffleit, Ellen Dorrit
- Hoffmeister, Cuno
- Holman, Matthew J.
- Holt, Henry E.
- Holvorcem, Paulo R.
- Hooke, Robert
- Hornsby, Thomas
- Horrocks, Jeremiah
- Houtermans, Fritz
- Hoyle, Fred
- Hu, Wayne
- Hubble, Edwin
- Hug, Gary
- Huggins, William
- Hulse, Russell Alan
- Humason, Milton
- Hurukawa, Kiichiro
- Huygens, Christiaan
- Hynek, Josef Allen
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