Philipp Peter Roos (later surnamed Rosa di Tivoli;[1] 1655–1706) was a German Baroque painter, active in and near Rome from 1677 onward.

He was born in Sankt Goar and learned to paint from his father, the landscape painter Johann Heinrich Roos.

In Rome, he worked often in the studio of Giacinto Brandi, and by 1681 had fallen in love with his daughter, for whom he converted to Catholicism and later married.

[4] In 1684, he acquired a large house on Vicolo del Riserraglio in the Rione San Paolo in Tivoli, near Rome, whence his surname.

[1][2] In his Italian style, he painted life-size figures and animals in a broad manner and a heavy brown tone.