Johann Voldemar Jannsen, Estonian journalist and poet (died 1890)

Johann Voldemar Jannsen was an Estonian journalist. He was one of the earliest figures of the Estonian national awakening, which he promoted through his newspaper, the Eesti Postimees, and two Estonian Song Festivals. He wrote the nationalist song "Mu isamaa, mu õnn ja rõõm", which became the national anthem of Estonia after its independence. Jannsen was the father of poet Lydia Koidula.