In 1918, there were 2 recorded legal changes made affecting LGBT people. In the previous year, there were 1 change made and 2 in the following year. A total of 22 legal changes were made in the 1910s.
- December 1Homosexual activity becomes male illegal, female legal.In the first post-medieval Criminal Code of the Principality of Serbia, named "Kaznitelni zakon" (Law of Penalties), adopted in 1860, sexual intercourse "against the order of nature" between males became punishable by from 6 months' to 4 years' imprisonment. As typical for the time, homosexual relations between women were excluded. Serbian law was continued in Yugoslavia
- November 11Homosexual activity becomes ambiguous.During the Second Polish Republic, same sex activity was not legislated against, but was considered taboo.