| Letty Alonzo | |
| Birth Name: | Letty Johnson Arrastia |
| Birth Date: | 1929 1, df=y |
| Birth Place: | Lubao, Pampanga, The Philippine Islands, U.S. |
| Death Date: | 2020 (aged 90–91) |
| Death Place: | Philippines |
| Occupation: | Actress |
| Yearsactive: | 1951-1953 |
| Spouse: | Mario Montenegro (1950s-1988; his death) |
| Children: | Honeylet Montenegro |
| Relatives: | Valeen Montenegro (granddaughter) Isabel Preysler (first-cousin-once-removed/niece) |
Blanca Leticia Arrastia y Johnson (28 January 1929 – 2020), better known as Letty Alonzo, was a Filipina actress from LVN Pictures who was typecast as a villain. She starred in a few films before leaving the entertainment industry after her marriage to fellow LVN actor, Mario Montenegro.
Alonzo was born on 28 January 1929. She was married to another famous LVN co-star, Mario Montenegro.[1] They became the grandparents to actress Valeen Montenegro through her daughter, beauty queen Honeylet, who married footballer Iñaki Vicente.[2] She died in 2020.[3]