Deckhands undertake a wide range of fishery and maritime work on land and at sea, including communications, supply, seamanship, hospitality and stores. They may also use equipment such as nets, lines and traps to catch fish, crustaceans and molluscs.

Delivery drivers use light vans, cars, utilities, motorcycles, scooters or bicycles to pick up and deliver goods, usually over short distances.

Dental assistants prepare patients for oral examination and assist other dental workers, such as dentists, dental therapists and dental hygienists, in providing treatment to the teeth, mouth and gums. Dental assistants also carry out reception and administration duties.

Dental hygienists use preventive, educational and therapeutic methods for controlling oral diseases to help individual patients and groups achieve and maintain oral health.

Dental technicians construct and repair dentures (false teeth) and other dental appliances, including crowns, bridges and orthodontic appliances.

Dentists diagnose and treat oral diseases, injuries and abnormalities of jaws, teeth and gums, undertake preventive procedures, conduct surgery and perform other specialist techniques.

Dermatologists specialise in the treatment of skin diseases such as eczema, acne, skin infections and psoriasis, using techniques such as ultraviolet light therapy, photodynamic therapy and laser treatment. Dermatologists also detect and treat skin cancers.

Dietary aides assist dietitians to maintain high standards of nutritional care for patients in hospital settings.

Dietitians apply the art and science of human nutrition to help people understand the relationship between food and health, make healthy dietary choices, and prevent and treat illness and disease.

A digital marketing specialist employs techniques to boost visibility and engagement with internet-based content, products and services. They may be involved in coordinating email campaigns and using analytics programs to track website visitors.

Digital printers use machines and software to control the production of print-based media for commercial print manufacturing sites and instant print shops.

Disability services instructors assess training needs, conduct training programmes and organise employment or recreation and leisure activities for people with intellectual, physical, sensory, social or emotional disabilities.

Disability support workers provide care, supervision and support for people with disabilities in the home, residential establishments, clinics and hospitals. They also work with other health professionals to maximise the individual's physical and mental wellbeing. They also provide companionship and emotional support, and when possible, promote independence and community participation.

Dispensary assistants work under the supervision of a pharmacist to prepare medicines, advise customers on non-medicinal products and assist with stock control.

Divers carry out a range of duties underwater using self-contained underwater breathing apparatus (SCUBA), surface breathing apparatus or underwater work chambers. With experience, and sometimes further training, divers may become a ship's diver or dive supervisor.