administration assistant jobs in Ontario

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10,000 administration assistant job listings in Canada. Find daily updated positions from leading job boards.


  • Southwestern Ontario, ON, Canada University of Waterloo Full-time

    About UsAt the University of Waterloo, we create and promote a culture where everyone can reach their full potential. As an employee, you get support & opportunities that empower you to advance your career. Explore how we can bring big ideas to life, together. The University is a welcoming workplace for those of all abilities, interests, and expertise. As...


  • Northwestern Ontario, ON, Canada Ontario First Nations Technical Services Corporation Full-time

    Administrative Assistant The Ontario First Nations Technical Services Corporation (OFNTSC) is a nonprofit organization that provides technical advisory services, training, and capacity development to First Nations communities in Ontario. By offering a wide range of specialized services and expertise, OFNTSC helps to enhance the quality of life, promote...


  • Eastern Ontario, ON, Canada RTX Full-time

    Location: CA-ON-RENFREW-114 ~ 1 Innovation Dr ~ INNOVATION PositionCountry: CanadaAt Raytheon Canada, we are committed to both our customers and employees. Our division provides Mission Support, servicing the defence, security and aerospace sectors with a broad range of high technology products and services. You will be part of a valuable team that allows...


  • Ontario, Canada CFMWS Full-time

    WHO WE AREThe Canadian Forces Morale and Welfare Services’ (CFMWS) supports the Canadian Armed Forces members and their families wherever they are in the world through the provision of fitness, recreation and leisure activities, family and charitable support, retail as well as personal financial services. We offer our employees the opportunity to work with...


  • Northwestern Ontario, ON, Canada Northern Peak HR Full-time

    a partnership between Dallan LP, Lac Des Mille Lac First Nation, Nigigoonsiminikaaning First Nation and Dale Levesque, a member of the Fort William First Nation. Additionally, Dallan LP is a 100% indigenous-owned business that provides industrial yard services which includes a variety of heavy equipment operations, maintenance and general labour. Further,...


  • Ontario, ON, Canada Adecco Remote Full-time $58,240 - $66,560 Contract

    **Senior Administrative Assistant – Part-Time, Interim** **Remote (you must reside in Ontario or Quebec) | 15–20 hours/week | $28–$32/hour** We are currently seeking an experienced Senior Administrative Assistant to provide interim executive and administrative support while our client works toward a longer-term direct hire solution. This is an...


  • Northwestern Ontario, ON, Canada Anishinabek Employment & Training Services Full-time

    The Ontario First Nations Technical Services Corporation (OFNTSC) is a nonprofit organization that provides technical advisory services, training, and capacity development to First Nations communities in Ontario.By offering a wide range of specialized services and expertise, OFNTSC helps to enhance the quality of life, promote self-sufficiency, and foster...


  • Northeastern Ontario, ON, Canada Wiikwemkoong Full-time $59,000 - $72,000 Contract

    Nakiiwin Azheyaaksin Employment Opportunity Administrative AssistantWiikwemkoong Child and Family Services is seeking qualified individuals to fill the position of Administrative Assistant. Wiikwemkoong Unceded Territory (WUT) Child and Family Services oversees and advocates for child and family matters by following the principals and ethics of...


  • Northeastern Ontario, ON, Canada RBC Full-time

    Job Description What is the opportunity? RBC Dominion Securities is a relationship-focused investment and wealth management firm that consistently ranks #1 in Canada. We are proud of our collaborative, supportive culture that enables success at every level and equips us to help our clients achieve their financial goals. The RBC Dominion Securities branch...


  • northwestern ontario, on, Canada Doane-Grant-Thornton-LLP Full-time $53,000

    Who we are You know those big cities that still feel like small towns? Where everyone’s friendly and helps each other out? That’s like Doane Grant Thornton. Except here we’re all professionals and there isn’t a mayor or a general store. What we’re trying to say is that we’re a large and growing professional services firm that still feels like a...


  • Southwestern Ontario, ON, Canada Waterloo International Full-time $62,000 - $77,000 Contract

    ## Administrative Assistant to the ChairApply: Waterloo, Ontario, Canada: Full time: Posted Today: 2026-02904At the University of Waterloo, we create and promote a culture where everyone can reach their full potential. As an employee, you get support & opportunities that empower you to advance your career. Explore how we can bring big ideas to life,...


  • Southwestern Ontario, ON, Canada University of Waterloo Full-time

    At the University of Waterloo, we create and promote a culture where everyone can reach their full potential. As an employee, you get support & opportunities that empower you to advance your career. Explore how we can bring big ideas to life, together. The University is a welcoming workplace for those of all abilities, interests, and expertise. As part of...


  • Kitchener, Ontario, Canada Eastern Synod of Evangelical Lutheran Church in Canada Full-time

    Administrative AssistantHours of Work20 hours per week/Mon.to Fri.Onsite – KitchenerSalary: $30 – $35 per hourReports To:Office ManagerPosition Mandate:This role primarily provides administrative support to the Eastern Synod scholarship committee, the Eastern Synod staff & Officers, Directors, pastors, Area Ministry Deans as required, and for CHARITUS as...


  • Toronto, Ontario, Canada Harbourfront Wealth Management Full-time

    Who we are:Harbourfront Wealth is a dynamic industry leader specializing in financial services and wealth management. We are a fast-growing wealth management firm with over $23 billion in assets under administration, comprised of five integrated entities: CIRO dealer, investment counsel, asset manager, U.S. Registered Investment Advisor (RIA) and insurance...


  • Mississauga, Ontario, Canada Harbourfront Wealth Management Full-time

    Who we are:Harbourfront Wealth is a dynamic industry leader specializing in financial services and wealth management. We are a fast-growing wealth management firm with over $23 billion in assets under administration, comprised of five integrated entities: CIRO dealer, investment counsel, asset manager, U.S. Registered Investment Advisor (RIA) and insurance...


  • Kitchener, Ontario, Canada Elby Professional Recruitment Full-time

    Purpose of Position This Administrative Assistant role provides essential support across administrative, operational, and HR functions. The position ensures seamless day-to-day operations by managing contracts, coordinating meetings and events, maintaining internal communications, and assisting executive leadership. The role is key to sustaining team...


  • Toronto, Ontario, Canada Lifemark Health Group Full-time

    Salary Range: $70,000.00 To $80,000.00 AnnuallyThis is a full-time permanent hybrid opportunity based out of our North York office (243 Consumers Rd) 4 days a week and 1 day a week will be work from home.Lifemark Health Group (LHG) is a market leader in customized healthcare solutions. With over 20 years of service excellence, LHG is one of the largest, most...


  • Markham, Ontario, Canada MNP Full-time

    Inspirational, innovative and entrepreneurial - this is how we describe our empowered teams. Combine your passion with purpose and join a culture that is thriving in the face of change.Make an impact with our Administration team as an Administrative Assistant. This diverse team of professionals directly contributes to the success of the firm by supporting...


  • Toronto, Ontario, Canada PCPI – Progress Career Planning Institute Full-time

    oProgram: Integrated Employment Services (IES)oLocation: 1200 Markham Road, ScarboroughoEmployment Type: Full-Time Three-month contractoHours of Work: 9:00 a.m. to 5:00 p.m.oReporting Relationship: Reports to the IES ManageroWork Arrangement: Fully On-SiteoPosting Closing Date: November 10, 2026oStart Date: As Soon As PossiblePCPI is a not-for-profit...


  • Ottawa, Ontario, Canada Harris Computer Full-time

    The Administrative Assistant role provides critical operational assistance to the Portfolio Leader and Director of Corporate Development. This role is ideal for detail-oriented professionals who excel in fast-paced processes and structured administrative processes. You will help maintain the integrity of our M&A operations by supporting the execution team...