| Frederick I. Ordway III | |
| Birth Date: | 4 April 1927 |
| Birth Place: | New York City |
| Death Place: | Huntsville, Alabama |
| Field: | Aerospace engineering |
| Known For: | Space advocacy, Technical consultant to 2001: A Space Odyssey |
| Spouse: | Maria Victoria Ordway (1950-2012) |
Frederick Ira Ordway III (4 April 19271 July 2014) was an American space scientist and author of visionary books on spaceflight.
Ordway was educated at Harvard University and completed several years of graduate study at the University of Paris and other universities in Europe. He owned a large collection of original paintings depicting astronautical themes. He was a member of many leading professional societies and was the author, co-author, or editor of more than thirty books and over three hundred articles.
As scientific consultant, he was part of the production team of 2001: A Space Odyssey.
At the time of his death, he was the longest-serving member of the American Rocket Society having joined in 1939, some 75 years earlier. Ordway served as a member of the faculty at The University of Alabama in Huntsville (UAH) from 1970 to 1973, and he was awarded an honorary doctorate by UAH in 1992.