| Type: | Bishop |
| Honorific-Prefix: | His Excellency |
| Aloísio Sinésio Bohn | |
| Bishop Emeritus of Santa Cruz do Sul | |
| Diocese: | Santa Cruz do Sul |
| Appointed: | 27 June 1986 |
| Term End: | 19 May 2010 |
| Predecessor: | Alberto Frederico Etges |
| Successor: | Canísio Klaus |
| Other Post: | Titular Bishop of Abbir Germaniciana (1977–1980) |
| Previous Post: | Auxiliary Bishop of Brasília (1977–1980) Bishop of Novo Hamburgo (1980–1986) |
| Ordination: | 23 December 1961 |
| Consecration: | 9 September 1977 |
| Birth Date: | 1934 9, df=yes |
| Birth Place: | Montenegro, Rio Grande do Sul, Brazil |
| Death Place: | Santa Cruz do Sul, Rio Grande do Sul, Brazil |
Aloísio Sinésio Bohn (11 September 1934 – 9 June 2022) was a Brazilian Roman Catholic prelate.
Bohn was born in Brazil and was ordained to the priesthood in 1961. He served as titular bishop of Abbir Germaniciana and auxiliary bishop of the Roman Catholic Archdiocese of Brasilia, Brazil, from 1977 to 1980. He then served as bishop of the Roman Catholic Diocese of Novo Hamburgo, Brazil, from 1980 to 1986 and finally served as bishop of the Roman Catholic Diocese of Santa Cruz do Sul, Brazil from 1986 until his retirement in 2010.[1]