Sir Philip Magnus, 1st Baronet (7 October 1842 – 29 August 1933) was a British educational reformer and politician, who represented the London University constituency as a Unionist from 1906 to 1922. He had previously been appointed director of the City and Guilds of London Institute, from where he helped oversee the creation of a modern system of technical education in the United Kingdom. He was married to the writer and teacher Katie Magnus, and was father of the publisher Laurie Magnus. Laurie predeceased him, and on Philip's death in 1933 he was succeeded in the baronetcy by Laurie's eldest son Philip.
After studying at University College School and University College London, where he took first-class honours in both arts and science, Magnus chose to take up a religious career. An active member of the Reform Judaism in Britain, he spent three years studying at the Hochschule für die Wissenschaft des Judentums in Berlin and returned to London to take up a post as assistant rabbi at the West London Synagogue in 1866.
During his time as rabbi, Magnus supplemented his income by teaching private students, which grew steadily into a regular occupation. He held a lectureship at Stockwell teacher training college, taught at University College London, and examined prospective teachers for the College of Preceptors. In 1880, he finally left his rabbinical work to become director of the newly formed City and Guilds of London Institute. He oversaw the rapid growth of the institute, focusing his attentions on the technical education departments, of which he became Superintendent in 1888; he would hold this post until retiring in 1915.