Bernard I of Baden was Margrave of the Margraviate of Baden from 1391 to 1431.

The Margraviate of Baden was a historical territory of the Holy Roman Empire. Spread along the right banks of the Upper Rhine in south-western Germany, it was named a margraviate in 1112 and existed until 1535, when it was split into the two margraviates of Baden-Durlach and Baden-Baden. The two parts were reunited in 1771 under Margrave Charles Frederick, even if the three parts of the state maintained their distinct seats to the Reichstag. The restored Margraviate of Baden was elevated to the status of electorate in 1803. In 1806, the Electorate of Baden, receiving territorial additions, became the Grand Duchy of Baden. The rulers of Baden, known as the House of Baden, were a cadet line of the Swabian House of Zähringen.