LinkedIn categorises people in 147 industries (17 main). This list is not visible in one view, which makes it a bit difficult to select the best one. To help you with this, please find below all industries.
Full list of all LinkedIn Industries
* Agriculture
o Farming
o Ranching
o Dairy
o Fishery
* Arts
o Motion Pictures and Film
o Museums and Institutions
o Fine Art
o Performing Arts
o Design
o Arts and Crafts
o Music
o Photography
o Graphic Design
* Construction
o Construction
o Building Materials
o Architecture & Planning
o Civil Engineering
* Consumer Goods
o Cosmetics
o Apparel & Fashion
o Sporting Goods
o Tobacco
o Supermarkets
o Food Production
o Consumer Electronics
o Consumer Goods
o Furniture
o Retail
o Wholesale
o Import and Export
o Wine and Spirits
o Luxury Goods & Jewelry
* Corporate
o Management Consulting
o Marketing and Advertising
o Market Research
o Public Relations and Communications
o Staffing and Recruiting
o Professional Training & Coaching
o Security and Investigations
o Facilities Services
o Outsourcing/Offshoring
o Human Resources
o Business Supplies and Equipment
* Educational
o Primary/Secondary Education
o Higher Education
o Education Management
o Research
o E-Learning
* Finance
o Banking
o Insurance
o Financial Services
o Real Estate
o Investment Banking
o Investment Management
o Accounting
o Venture Capital & Private Equity
o Commercial Real Estate
o Capital Markets
* Government
o Military
o Legislative Office
o Judiciary
o International Affairs
o Government Administration
o Executive Office
o Law Enforcement
o Public Safety
o Public Policy
o Political Organization
o Government Relations
* High Tech
o Defense & Space
o Computer Hardware
o Computer Software
o Computer Networking
o Internet
o Semiconductors
o Telecommunications
o Information Technology and Services
o Nanotechnology
o Computer & Network Security
o Wireless
* Legal
o Law Practice
o Legal Services
o Alternative Dispute Resolution
* Manufacturing
o Aviation & Aerospace
o Automotive
o Chemicals
o Machinery
o Mining & Metals
o Oil & Energy
o Shipbuilding
o Utilities
o Textiles
o Paper & Forest Products
o Railroad Manufacture
o Electrical/Electronic Manufacturing
o Plastics
o Mechanical or Industrial Engineering
o Renewables & Environment
o Glass, Ceramics & Concrete
o Packaging and Containers
o Industrial Automation
* Media
o Broadcast Media
o Newspapers
o Publishing
o Printing
o Writing and Editing
o Online Media
o Media Production
o Animation
* Medical
o Biotechnology
o Medical Practice
o Hospital & Health Care
o Pharmaceuticals
o Veterinary
o Medical Devices
o Health, Wellness and Fitness
o Alternative Medicine
o Mental Health Care
* Non-profit
o Consumer Services
o Non-Profit Organization Management
o Fund-Raising
o Program Development
o Think Tanks
o Philanthropy
o International Trade and Development
* Recreational
o Entertainment
o Gambling & Casinos
o Leisure, Travel & Tourism
o Hospitality
o Restaurants
o Sports
o Food & Beverages
o Recreational Facilities and Services
o Computer Games
o Events Services
* Service
o Information Services
o Libraries
o Environmental Services
o Individual & Family Services
o Religious Institutions
o Civic & Social Organization
o Translation and Localization
* Transportation
o Package/Freight Delivery
o Transportation/Trucking/Railroad
o Warehousing
o Airlines/Aviation
o Maritime
o Logistics and Supply Chain
Check also your colleagues on LinkedIn which industry they selected.