Himmet Efendi (d. 1095/1684), born in Bolu, was a mystic of Bayrami-Shamsi origin regarded as the founder (pîr) of the Himmetiyye branch. Having studied the religious sciences in Istanbul and served as a professor, he turned to Sufism and became a disciple of Hacı Ahmed Efendi of Bolu. He preached at the Davud Paşa Mosque in Üsküdar and for a long period at the Kasımpaşa Mosque, becoming known for his distinctive method of dhikr. He died on 3 February 1684 and was first buried at the tomb of Bezcizâde Muhyiddin Efendi in Divitçiler, Üsküdar; his grave was later relocated to the courtyard cemetery of the Küçük Selimiye Mosque.