| Mariano Díez Moreno | |
| Birth Date: | 2 October 1949 |
| Birth Place: | Toledo, Spain |
| Death Date: | 18 June 2022 (aged 72) |
| Death Place: | Madrid, Spain |
| Nationality: | Spanish |
| Occupation: | Jurist |
| Education: | University of Salamanca |
| Party: | AP |
| Office: | Member of the Cortes of Castilla–La Mancha |
| Term Start: | 8 May 1983 |
| Term End: | 2 July 1987 |
| Constituency: | Toledo |
| Office2: | President of the Provincial Deputation of Toledo |
| Term Start2: | 1987 |
| Term End2: | 1991 |
| Predecessor2: | Isidro del Río Martín |
| Successor2: | Adolfo González Revenga |
Mariano Díez Moreno (2 October 1949[1] – 18 June 2022) was a Spanish politician.
A member of the People's Alliance, he served in the Cortes of Castilla–La Mancha from 1983 to 1987 and was president of the Provincial Deputation of Toledo from 1987 to 1991.[2]
Díez died in Madrid on 18 June 2022 at the age of 72.[3]