Isaac Colton Ash (January 26, 1861 – July 15, 1933) was a banker, real-estate dealer and member of the Los Angeles City Council in the 20th century.

[1] Ash worked at Indianapolis Bank and Trust Company for 27 years, where he became vice president and credit manager.

Ill health of his wife impelled the pair to move to Los Angeles in 1912, where Ash invested heavily in Highland Park real estate.

[1] On July 15, 1933, Ash was stricken with a heart attack shortly after alighting from a streetcar in downtown Los Angeles.

A resident complained that Ash's property value would be increased by $5,000 but that the councilman's land had been omitted from the tax district that would have to pay for the improvement.