Matsuida (松井田町, Matsuida-machi) was a town located in Usui District, Gunma Prefecture, Japan.

As of 2003, the town had an estimated population of 16,556 and a density of 94.58 persons per km2. The total area was 175.05 km2.

On March 18, 2006, Matsuida was merged into expanded city of An'naka.

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36°19′N 138°48′E / 36.317°N 138.800°E / 36.317; 138.800