Semide is a commune in the Ardennes department in the Grand Est region in northern of France.

It is located 200 km (120 mi) northeast of Paris, 40 km (25 mi) of Reims.

Semide has not always been what it is today. Formerly, the chalky soil gave bad harvest. This poor land, where resinous had been plant under the Second Empire provided to the sheep kine sparse grass. In the 1960s, Semide underwent a change which has modified its economy, its way of life and the landscape. Mecanisation, motorisation, clearing, fertilizer utilization and regrouping of lands mark out the intensive farming beginning dominates by cereals.

The inhabitants are called Semidas.

Historical population

Year	Pop.	±%
1962	314	—
1968	293	−6.7%
1975	251	−14.3%
1982	264	+5.2%
1990	258	−2.3%
1999	245	−5.0%
2008	213	−13.1%

• St-Pierre St-Paul Church from the twelfth century.
• Big Bertha : Vestige of an installation of a Langer Max (officially called 38 cm SKL/45), wrongly called by usage Big Bertha.
• National graveyard from the First World War.

Semide main's activity is farming, predominantly cereal and sugar beet production.

• Communes of the Ardennes department

• Semide youth guild Website