Ossian Everett Mills (February 16, 1856 – December 26, 1920) was the founder of Phi Mu Alpha Sinfonia fraternity at the New England Conservatory of Music in 1898.

[3] He served on the board of trustees of the Beneficent Society of the New England Conservatory Music and was elected its auditor in 1895 and its assistant treasurer in 1898.

[3] That year, he founded and organized the students' annual Easter and Christmas "Song and Flower Mission" that visited the sick in Boston's city hospital.

[13][3][4] He organized this charity for nearly thirty years, involving student musicians and singers and volunteers helping to gather flowers after church services to distribute to each patient.

[1] On December 28, 1928, Phi Mu Alpha Sinfonia erected a memorial at Mill's grave, with the epitaph, “Sacrifice, Secret Zeal, and Truth.”[3][2]