| Birth Date: | 11 May 1925 |
| Birth Place: | Szczurowa, Poland |
| Death Place: | Skierniewice, Poland |
| Workplaces: | Research Institute of Pomology and Floriculture |
| Discipline: | Botany |
| Sub Discipline: | Pomology |
Stanisław Wojciech Zagaja (pronounced as /pl/; 11 May 1925 in Szczurowa, Poland – 17 December 2004 in Skierniewice, Poland) was a Polish pomologist, grower of orchard plants. Professor (since 1963) and director (since 1984) of the Research Institute of Pomology and Floriculture in Skierniewice, member of Polish Academy of Sciences since 1983.
His research was focused on fruit tree breeding, selection and seed physiology as well as working with apple vegetative rootstocks, and hybrids of peach and cherry.