Mečislovas Davainis-Silvestraitis (Polish: Mieczysław Dowojna-Sylwestrowicz; 20 April 1849 – 31 May 1919) was a Lithuanian activist during the Lithuanian National Revival best known for his collection of Lithuanian folklore. During his life, Davainis-Silvestraitis contributed texts to numerous Lithuanian periodicals, including Aušra (82 texts in 1883–1886), Vienybė lietuvninkų (a paid correspondent in 1891–1896), Lietuvių laikraštis (briefly worked as an editorial staff in 1904–1905). He also wrote romantic poetry and published two booklets with his poems in 1884 and 1904.