Jacob Frankenfield (July 7, 1838 – August 31, 1914) was an American businessman and politician who served in the Minnesota Senate from 1874 to 1875 and Los Angeles City Council from 1885 to 1890.

He was the President of the Los Angeles City Council for a year, and during his tenure helped with the building of the Los Angeles City Hall and helped change the name of Fort Street to Broadway.

[2][3] In 1875, President Ulysses S. Grant appointed Frankenfield to the Collector of Customs for the district of Minnesota, which he held until 1879.

In 1889, he was elected as the President of the Los Angeles City Council before retiring in 1890.

[9] Frankenfield died on August 31, 1914, at his family residence in South Park.