| Old Costa Rican Sign Language | |
| States: | Costa Rica |
| Region: | metro San Jose |
| Speakers: | perhaps 100 |
| Date: | 1991 |
| Ref: | linglist |
| Familycolor: | sign language |
| Family: | deaf-community sign language |
| Iso3: | none |
| Linglist: | 1a4 |
| Glotto: | orig1234 |
| Glottorefname: | Original Costa Rican Sign Language |
Old Costa Rican Sign Language is a deaf-community sign language of San Jose, spoken by people born before about 1945. Along with American Sign Language, it is one of the sources of New Costa Rican Sign Language.