- Aroma Studio - Home study certification courses available at three levels, as well as a teacher training course. Located in New York.
- Aromanet - Offers classes live and by correspondence, including certificate, advanced diploma, spa, and nurse programs. Located in Ontario, Canada.
- Atlantic Institute of Aromatherapy - A practitioner course and an advanced studies course are offered. Located in Tampa, Florida.
- Atwood Institute for Research and Education - Clinical Aromatherapy certification in both residential and home study formats. Located in Glendale, Arizona.
- Australasian College of Health Sciences - Offers nationally accredited distance education certification courses in aromatherapy and many other areas of alternative healthcare. Located in Portland, Oregon.
- Australasian College of Natural Therapies - Offers a home study foundations course, and courses in other natural therapies. Located in Sydney, Australia.
- Essence Journeys - Provides a six-week introductory course through e-mail. Based in Hawi, Hawaii.
- Essential Oil Resource Consultants - Offers Advanced Clinical Aromatherapy through distance learning, a three-level research-based course that combines both French and English methods.
- Essential Training Solutions Ltd - Aromatherapy, reflexology and anatomy and physiology revision/reference packages on CD ROM. Paper alternatives also available. Located in England.
- Healing Scents Holistic Clinic and Training Centre - Aromatherapy Diploma with two modules that may be completed through self-paced home study. Located in Victoria, B.C.
- Michael Scholes School for Aromatic Studies - Options include four different courses, and a 300-hour diploma program, all available through home study. Based in Marina Del Rey, California.
- Nature Care College - College of natural therapies in Sydney, Australia, offering distance learning courses in aromatherapy and other modalities.
- Pacific Institute of Aromatherapy - Distance learning options include an International Certification Course, and a three-part Masters Series. Based in San Rafael, California.
- School of Natural Healing - Offers a program with three levels of aromatherapy courses, covering an introduction to essential oils, formulation, and treatment. Located in Springville, Utah.
- Spring Renewal - Offers a self-paced home study course with 24 lessons and a final exam and project. Based in Saugatuck, Michigan.
- The Institute for Integrative Healthcare Studies - Several CEU home study classes are presented, including a 40-hour Aromatherapy Essentials course.
- The Kevala Centre - Distance learning Aromatherapy Diploma Course, consisting of 12 modules covering topics such as history, neurology, massage, acupressure, and consultation. Located in the United Kingdom.
- The School of Natural Health Sciences - This UK based school offers a basic course and an Advanced Aromatherapy Diploma.
- West Coast Institute of Aromatherapy Inc. - Three home study courses are offered, covering basic to advanced topics. Based in British Columbia, Canada.