安省 144 个列入工种

安大略是「这个工种到底受不受管」有精确法律答案的省份，因为答案是法规里的一张附表，而不是网站上的一个页面。这张表直接解析自 O. Reg. 876/21 — Prescribed Trades and Related Matters (Building Opportunities in the Skilled Trades Act, 2021)。

144 个列入工种 —— 你可以在其中做学徒的受认可工种。
23 个强制工种 —— 除非你持有资格证书（C of Q）、临时资格证书，或者是注册培训协议下的学徒，否则做这类工作是违法的。由部级检查员执法，可处行政罚款。
83 个工种有认证考试。
33 个工种受师徒比例约束 —— 这个比例解释了为什么有些工种不管市场多缺人都难进：雇主在编熟练工不够时，法律上不能收你。

23 个强制工种

Alignment and brakes technician
Auto body and collision damage repairer
Auto body repairer
Automotive electronic accessory technician
Automotive service technician
Electrician — construction and maintenance
Electrician — domestic and rural
Fuel and electrical systems technician
Hairstylist
Hoisting engineer — mobile crane operator 1
Hoisting engineer — mobile crane operator 2
Hoisting engineer — tower crane operator
Motorcycle technician
Plumber
Refrigeration and air conditioning systems mechanic
Residential air conditioning systems mechanic
Residential (low rise) sheet metal installer
Sheet metal worker
Sprinkler and fire protection installer
Steamfitter
Transmission technician
Truck and coach technician
Truck-trailer service technician

全部 144 个列入工种

工种	强制	认证考试	师徒比例
Aboriginal child development practitioner
Agricultural — dairy herdsperson
Agricultural equipment technician		✅
Agricultural — fruit grower
Agricultural — swine herdsperson
Alignment and brakes technician	✅	✅
Appliance service technician		✅
Arborist		✅
Architectural glass and metal technician		✅	✅
Assistant cook
Auto body and collision damage repairer	✅	✅
Auto body repairer	✅	✅
Automotive electronic accessory technician	✅	✅
Automotive glass technician
Automotive painter		✅
Automotive service technician	✅	✅
Baker
Baker-patissier		✅
Bearings mechanic
Blacksmith
Brick and stone mason		✅	✅
Cabinet maker
Cement (concrete) finisher		✅	✅
Chef
Child and youth worker
Child development practitioner
Computer numerical control (CNC) programmer
Concrete pump operator		✅
Construction boilermaker		✅	✅
Construction craft worker		✅
Construction millwright		✅	✅
Cook		✅
Developmental services worker
Die designer
Draftsperson — mechanical
Draftsperson — plastic mould design
Draftsperson — tool and die design
Drywall, acoustic and lathing applicator		✅	✅
Drywall finisher and plasterer		✅	✅
Educational assistant
Electric motor system technician		✅
Electrician — construction and maintenance	✅	✅	✅
Electrician — domestic and rural	✅	✅	✅
Electrician (signal maintenance)
Electronic service technician
Elevating devices mechanic
Entertainment industry power technician		✅
Exterior insulated finish systems mechanic
Facilities mechanic		✅
Facilities technician		✅
Floor covering installer		✅	✅
Fuel and electrical systems technician	✅	✅
Gemsetter/goldsmith
General carpenter		✅	✅
General machinist		✅
Hairstylist	✅	✅
Hazardous materials worker		✅
Heat and frost insulator		✅	✅
Heavy duty equipment technician		✅
Heavy equipment operator — dozer		✅
Heavy equipment operator — excavator		✅
Heavy equipment operator —tractor loader backhoe		✅
Hoisting engineer — mobile crane operator 1	✅	✅	✅
Hoisting engineer — mobile crane operator 2	✅	✅	✅
Hoisting engineer — tower crane operator	✅	✅	✅
Horse groom
Horse harness maker
Horticultural technician		✅
Hydraulic/pneumatic mechanic
Industrial electrician		✅
Industrial mechanic millwright		✅
Information technology — contact centre customer service agent
Information technology — contact centre sales agent
Information technology — contact centre technical support agent
Information technology — hardware technician
Information technology — network technician
Institutional cook		✅
Instrumentation and control technician		✅
Ironworker — generalist		✅	✅
Ironworker — structural and ornamental		✅	✅
Light rail overhead contact systems linesperson
Locksmith
Machine tool builder and integrator		✅
Marine engine technician		✅
Metal fabricator (fitter)		✅
Micro electronics manufacturer
Motive power machinist		✅
Motorcycle technician	✅	✅
Mould designer
Mould maker		✅
Mould or die finisher
Native clothing and crafts artisan
Native residential construction worker
Network cabling specialist		✅
Optics technician (lens and prism maker)
Packaging machine mechanic
Painter and decorator — commercial and residential		✅	✅
Painter and decorator — industrial		✅	✅
Parts technician		✅
Pattern maker		✅
Plumber	✅	✅	✅
Powered lift truck technician		✅
Powerline technician		✅	✅
Precast concrete erector			✅
Precast concrete finisher			✅
Pressure systems welder		✅
Process operator — food manufacturing
Process operator — power
Process operator — refinery, chemical and liquid processes
Process operator — wood products
Railway car technician		✅
Recreation vehicle technician		✅
Refractory mason
Refrigeration and air conditioning systems mechanic	✅	✅	✅
Reinforcing rodworker		✅	✅
Relay and instrumentation technician
Residential air conditioning systems mechanic	✅	✅	✅
Residential (low rise) sheet metal installer	✅	✅	✅
Restoration mason			✅
Retail meat cutter
Roofer		✅	✅
Saddlery
Saw filer/fitter
Sheet metal worker	✅	✅	✅
Small engine technician		✅
Special events co-ordinator
Sprinkler and fire protection installer	✅	✅	✅
Steamfitter	✅	✅	✅
Surface blaster		✅
Surface mount assembler
Terrazzo, tile and marble setter		✅	✅
Thin film technician
Tool and cutter grinder
Tool and die maker		✅
Tool and gauge inspector
Tool/tooling maker		✅
Tractor-trailer commercial driver
Transmission technician	✅	✅
Truck and coach technician	✅	✅
Truck-trailer service technician	✅	✅
Turf equipment technician
Utility arborist		✅
Water well driller
Welder		✅

来源：https://www.ontario.ca/laws/regulation/210876 —— 由 scripts/scrape-ontario-trades.mjs 解析。这是摘要，不是法律建议；以法规原文为准。