Reginald Noël Sullivan (December 25, 1890 – September 15, 1956) was a wealthy American concert singer, philanthropist, and patron of the arts, who is remembered for entertaining performers, artists and writers in his opulent residence on Hyde Street, San Francisco.

Although not academically inclined, he was interested in music, developing his singing talents abroad and performing as an amateur singer.

[5][6] Following serious problems with his father's health, in 1925 Sullivan returned to San Francisco to take care of him in the family home on 2323 Hyde Street.

[9] In the early 1930s, Noël supported the music scene in San Francisco, gaining a reputation as an adept amateur concert singer.

[1] As a result of depressed markets in the 1930s, Sullivan increasingly experienced financial difficulties despite being an heir of his wealthy uncle, the politician James D. Phelan, who died in 1930.

As a result of his strong affection for his sister Ada, a Carmelite nun known as Agnes of Jesus, he provided support for the monasteries in Santa Clara, Carmel and San Diego while establishing an additional community in Berkeley.