Solomon Loeb (born Salomon Löb, June 29, 1828 – December 12, 1903) was a German-born American banker and businessman.

He was a merchant in textiles and later a banker with Kuhn, Loeb & Co. His father, a devout Jew, had been a small corn- and wine-dealer in Worms, which belonged to the Grand Duchy of Hesse and by Rhine.

He settled in Cincinnati with the textiles merchant Kuhn, Netter & Co.

He moved to New York City in 1865 and with his partner, Abraham Kuhn, started the banking house of Kuhn, Loeb and Co. His second born son, James Loeb, joined the bank in 1888 (and left in 1901).

[citation needed] Among his donations was the Hebrew Charities Building that formerly stood at Second Avenue and 21st Street in New York City.