Rosicrucian Order, AMORC – www.rosicrucian.org
The established Rosicrucian initiatory and fraternal organization based originally based on Harvey Spencer Lewis’s works.
Builders of the Adytum (BOTA) – www.bota.org
An esoteric school based on Paul Foster Case’s work with the Tarot and Qabalah
Servants of the Light (SOL) – Servants of the Light | We Teach Practical Qabalah
An esoteric school established by Dion Fortune
Brotherhood of Light (BOL) – light.org | Home of the Authentic Brotherhood of Light Lessons on the Hermetic Sciences
An esoteric school developed based on A. Zain’s focus on astrological concepts.
Brotherhood of the Eternal Light (BOEL) – Brotherhood of the Eternal Light – BOEL – Mystery School for the Study of Qabbalah, Magic and the Western Mystery Tradition (boel-mystery-school.org)
A continuation and expansion of the BOL, but founded by long-time BOL member Delores Ashcroft-Nowicki.
Hermetic Order of the Golden Dawn (GD) – The Hermetic Order of The Golden Dawn® (hermeticgoldendawn.org)
This hermetic school is based on the long-time Golden Dawn and is currently facilitated by Chic and Tabatha Cicero.
Ordus Templi Orientus (OTO) – www.oto.org (and) US Grand Lodge – Ordo Templi Orientis (oto-usa.org)
An magical school based on Alister Crowley’s works.
Church of the Hermetic Sciences – Ordo Templi Astarte/Temple of Asterte (CHS/OTA) – The Church of The Hermetic Sciences, Inc. – Promoting and Advancing the Western Esoteric Tradition Since 1971 (ning.com)
There are a few more that I would also refer to, all based on the mystic’s interest, focus, maturity, personal responsibility, mental stability, consciousness and overall attitudes.
I cannot recommend organizations that are based on a single leader guru or dogma without individual thought and challenge.
More references and details at Ezoteric and Occult Organizations (hermetics.org) but many of the links are bad, as Orders and Schools come and go by the decades.