Otto Schwartz Weeks, QC was a lawyer and political figure in Nova Scotia, Canada.
He represented Guysborough County in the Nova Scotia House of Assembly from 1874 to 1878 and from 1882 to 1890 as a Liberal member.
He was born in Halifax, Nova Scotia, the son of Otto Richard Schwartz Weeks and Maria Morris.
He was admitted to the Nova Scotia bar in 1853, later setting up practice in Windsor.
He was first elected to the provincial assembly in an 1875 by-election, after having been selected as attorney general.