Friedrich Wilhelm Krummacher (1796-1868) was a German Reformed pastor.

His father (Friedrich Adolf K.) and his uncle (Gottfried Daniel K.) were both noted theologians. 
Friedrich Wilhelm Krummacher studied theology at Halle and Jena, and became pastor successively at Frankfurt am Main (1819), Ruhrort (1823), Gemarke, near Barmen (1825) and Elberfeld (1834). 
In 1843 he came to New York. He declined a theological professorship in Mercersburg, Pennsylvania, and afterward returned to Berlin. 
Although a minister of the Reformed Church, he was a zealous advocate of the older Lutheranism, and gave great offence by his denunciation of rationalists.

He wrote many works, many of which have been translated into English, Dutch and French.