Effie Hinckley Ober Kline (1843 – February 15, 1927) was an American opera manager and booking agent.

[3] She founded the Boston Ideal Opera Company (later known as "The Bostonians") in 1879, with Adelaide Phillipps and Myron W. Whitney among the cast members.

[4] Her company presented American operettas, popular operas such as The Bohemian Girl and The Marriage of Figaro, and the Gilbert and Sullivan favorite H.M.S.

Her husband was personal attorney of John D. Rockefeller, and worked for Standard Oil Company for many years, before he died in 1917.

[2] Effie Ober Kline's scrapbooks are preserved at Parker House, a historical site in Blue Hill, Maine.