| Walter Gassire | |
| Fullname: | Walter Antonio Gassire Osorio |
| Birth Date: | 21 August 1946 |
| Birth Place: | Florida, Uruguay |
| Position: | Goalkeeper |
| Youthyears1: | –1963 |
| Youthclubs1: | Peñarol |
| Years1: | 1963–1965 |
| Years2: | 1965–1972 |
| Years3: | 1974–1980 |
| Years4: | 1980–1981 |
| Years5: | 1981–1982 |
| Years6: | 1982–1983 |
| Clubs1: | Montevideo Wanderers |
| Clubs2: | Defensor Sporting |
| Clubs3: | Toluca |
| Clubs4: | Atletas Campesinos |
| Clubs5: | Atlético Español |
| Clubs6: | Tampico Madero |
| Caps4: | 15 |
| Caps5: | 5 |
| Caps6: | 26 |
| Goals4: | 0 |
| Goals5: | 0 |
| Goals6: | 0 |
| Manageryears1: | – |
Walter Antonio Gassire Osorio (21 August 1946 – 19 March 2023) was a Uruguayan footballer who played as a goalkeeper. He won the Mexican Primera División with Deportivo Toluca.
Born in Florida, Gassire began playing football with the youth teams of C.A. Peñarol. He made his professional debut with Montevideo Wanderers in 1963, and two years later he moved to Defensor Sporting for six seasons.[1]
In 1974, Gassire moved to Mexico where he spent six seasons with Deportivo Toluca, winning the league in 1974–75.[2] He developed brain cancer while playing with Toluca in 1980. He recovered and joined Atletas Campesinos but had an injured Achilles tendon and left after six months. He next had a brief stint at Atlético Español and then finished his career at Tampico Madero in 1983.
After he retired from playing, Gassire became a football coach. He was an assistant manager with Toluca in 1986 and again with former teammate, Héctor Hugo Eugui, in 2011.[3]
Gassire died on 19 March 2023, at the age of 76.[4]