Oshawa, On Administrative assistant Jobs – 27 Openings This Week

Executive Administrative Assistant
Ontario Power Generation —Oshawa, ON
- $57,000–$85,500 a year
- Contract
- Microsoft Powerpoint
- Microsoft Word
- Microsoft Excel
4d
Office Administrator / Dispatcher / Accounts Receivable
Tracey Refrigeration INC —Oshawa, ON
- $20–$26 an hour
- Full-time
- Administrative experience
- Accounting
- QuickBooks
- Dental care
- Vision care
Quick apply
Executive Assistant to CEO
Bravura Architectural Products —Whitby, ON
- $60,000–$80,000 a year
- Full-time
- AutoCAD
- Construction experience
- Business
- Dental care
- Paid time off
Quick apply
3d
Entry-Level Executive & Administrative Coordinator & Collections Administrator - Full/Part-time
iTek Innovative Solutions Inc. —Oshawa, ON
- $47,000–$76,000 a year
- Part-time
- Customer service
- Administrative experience
- Analysis skills
- Dental care
- Tuition reimbursement
Quick apply
22h
Administrative Assistant
RioCan —Ajax, ON
- $51,500–$71,000 a year
- Full-time
- Microsoft Word
- Microsoft Excel
- Microsoft Outlook
- Dental care
- Tuition reimbursement
Quick apply
Administrative Assistant
MNP —Oshawa, ON
- $40,000–$65,000 a year
- Overtime
- Microsoft Powerpoint
- Microsoft Excel
- Business
Administrative Coordinator
Auxilium Health —Oshawa, ON
- $40,000–$50,000 a year
- Full-time
- Microsoft Powerpoint
- Microsoft Word
- Microsoft Excel
Quick apply
10d
Administrative Support Rehab
Durham Medical —Oshawa, ON
- $19–$24 an hour
- Full-time
- Medical office experience
- Administrative experience
- High school diploma or GED
Quick apply
Administrative Assistant
Complete Restoration Services —Pickering, ON
- $17.21–$25.18 an hour
- Full-time
- Google Suite
- Customer service
- Medical office experience
- Dental care
- Paid time off
Quick apply
3d
Administrative Assistant
Durham Convention Centre —Ajax, ON
- $17.60–$20.00 an hour
- Full-time
- Microsoft Powerpoint
- Microsoft Word
- Hospitality
Quick apply
Optical Sales & Administrative Assistant
Red House Vision Centre —Oshawa, ON
- $20–$23 an hour
- Full-time
- Sales
- Inventory management
- Customer service
- Vision care
- Flexible schedule
Quick apply
2d
Executive Assistant - PFT
Durham Community Health Centre —Oshawa, ON
- $54,900–$68,600 a year
- Full-time
- Microsoft Office
- Hotel
- Administrative experience
Quick apply
Administrative Coordinator
Bethesda House —Bowmanville, ON
- $23–$26 an hour
- Weekends as needed
- Microsoft Office
- Databases
- Administrative experience
- Dental care
- Paid time off
Quick apply
Executive Assistant to the Associate Vice President, Innovation and Research
Durham College —Oshawa, ON
- $77,550–$96,939 a year
- Full-time
- Microsoft Powerpoint
- Microsoft Word
- Microsoft Excel
Medical Office Assistant (MOA) (Full-Time/Casual)
Oshawa Clinic Group —Whitby, ON
- $21.31–$23.50 an hour
- 8 hour shift
- Administrative experience
- Organizational skills
- Computer skills
- Flexible schedule
Quick apply
4d
Office Assistant
DARS —Pickering, ON
- $20–$27 an hour
- Part-time
- Social media management
- Microsoft Office
- Administrative experience
- Flexible schedule
Quick apply
5d
Receptionist/Music Office Administrator and Music Teacher
WISDOMINDS MUSIC LESSON CENTRE —Oshawa, ON
- $19–$22 an hour
- Full-time
- Social media management
- Customer service
- Public speaking
Quick apply
4d
Legal Administrative Assistant
LendCare —Pickering, ON
- $18.10–$20.50 an hour
- Full-time
- Customer service
- Administrative experience
- Organizational skills
Quick apply
Auto Parts Yard & Office Assistant
Port Perry Auto Wreckers —Oshawa, ON
- $20 an hour
- Full-time
- Heavy lifting
- Heavy equipment operation
- Forklift
Quick apply
Rehab Clinic Office Administrator
Total Rehab Orthopedic & Athletic Medicine —Ajax, ON
- $17.60–$22.00 an hour
- Part-time
- Medical office experience
- Administrative experience
- Organizational skills
Quick apply
4d

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Executive Administrative Assistant

Ontario Power Generation -
Oshawa, ON

Apply Now

Job details

Contract | Fixed term contract
$57,000–$85,500 a year
4 days ago

Qualifications

Microsoft Powerpoint
Microsoft Word
Microsoft Excel
Microsoft Outlook
Post-secondary education
Administrative experience
Business development
Communications
Proofreading
Business
Communication skills

Full job description

Location: Oshawa, ON, CA, L1H 4P7

Req ID: 57386

Status: Contract (up to 24 months)

Working Conditions: On-site

Education Level: Post secondary diploma/degree in Business Administration, Communications, or a related field preferred

Base Location: Oshawa, ON

Shifts(s): Days

Travel: 10%

Deadline to Apply: July 13, 2026

Salary Range: $57,000.00 - $85,500.00 Per Year

Electrify your career and help build a brighter tomorrow.

Every generation has a challenge that defines them. At OPG, we are calling on all innovators, disruptors, thought leaders and change-makers. Join us as we work to electrify life in one generation and build a sustainable future powered by our electricity, our ideas, and our people. Join OPG and make history.

Whether you work in the skilled trades or are a business professional, a career at OPG is an opportunity to electrify your life on - and off - the job.

JOB OVERVIEW

Ontario Power Generation (OPG) is looking for a dynamic, strategic and results-driven professional to join our team in the role of Senior Executive Administrative Assistant.

Reporting to the SVP Nuclear Sustainability Strategies, this position is responsible to provide comprehensive executive support—including travel coordination, expense management, calendar oversight, meeting documentation, and stakeholder relations—to senior Hydro business development leaders, leveraging advanced administrative skills and professionalism.

KEY ACCOUNTABILITIES

Prepare, submit, and track detailed expense reports primarily through Concur, ensuring accuracy, timely processing, and strict adherence to company policies.
Proactively manage multiple executives’ calendars, including scheduling meetings across time zones, resolving conflicts, and collaborating with other administrative staff to ensure alignment and availability.
Organize, attend, and document key meetings by preparing agendas, taking accurate minutes, tracking action items, and distributing follow-ups as required.
Draft, proofread, and format correspondence, reports, and presentations using Microsoft Word, Excel, and PowerPoint; ensure all documents meet corporate standards.
Build and maintain strong working relationships with internal and external stakeholders, acting as a professional representative for the executive team and facilitating smooth communication.
Maintain efficient office systems, suggest improvements to administrative processes, and support the smooth operation of the business development group.
Handle sensitive information with discretion and maintain a high level of professionalism in all interactions, leveraging 7–10 years of executive support experience to anticipate needs and resolve issues proactively.

QUALIFICATIONS

Post secondary diploma/degree in Business Administration, Communications, or a related field preferred.
Over 7 years experience working with managing calendars, processing expense reports coordinate and book complex travel arrangements (flights, hotels, transportation) for senior managers and directors.
Proven expertise in coordinating complex travel arrangements and managing expense reports, with strong proficiency in Concur or similar systems.
Advanced skills in calendar management, meeting scheduling, and collaboration tools such as Microsoft Outlook, Teams, and Office Suite (Word, Excel, PowerPoint).
Exceptional written and verbal communication skills, with experience drafting, proofreading, and formatting professional documents and correspondence.
Strong relationship-building and interpersonal skills, demonstrating professionalism and discretion when interacting with stakeholders at all levels.
Highly organized with a proactive approach to office management, process improvement, and the ability to maintain confidentiality in handling sensitive information.

The successful candidate will exhibit uncompromising integrity and commitment to upholding corporate values, and the OPG Code of Business Conduct.

OPG is committed to fostering an inclusive, equitable, and accessible environment. If you require accommodation during the selection process, please contact [email protected]

What makes a career at OPG different?

With operations across Ontario and the United States, OPG is one of the most diverse power producers in North America. As the largest generator in Ontario, we meet approximately 50% of the province’s electricity needs, largely from low-carbon sources like nuclear and hydro.

As we work to achieve our vision of Electrifying life in one generation, OPG and our family of companies are also helping advance the development of new low-carbon technologies such as Small Modular Reactors (SMRs), refurbishment projects, and electrification initiatives to help power the growing demands of a growing economy. Join OPG and make history.

Please submit your application online at https://jobs.opg.com/. OPG thanks all those who apply; however, only candidates considered for an interview will be contacted.

Please note: All job postings at OPG are to fill existing vacancies within our organization.

OPG may use artificial intelligence (AI) tools as part of the applicant screening process. However, applications will also be reviewed by a member of our Recruitment team to ensure a fair and thorough assessment.

The base salary range considers many factors including, but not limited to experience, education, and training, including any collective agreement requirements for union represented positions. It is not typical for the salary to be offered near the top of the range, and salary is dependent on numerous factors. For management roles, the base salary range does not represent the total compensation package. The total compensation package for regular full-time management roles includes pay-for-performance programs for annual and medium time periods. Maintaining a high-performance culture and excellence is a core expectation of every member of our leadership team and is rewarded through the established compensation framework.

OPG is committed to employment equity. As such, we encourage applicants from equity-seeking communities (Indigenous Peoples, racialized persons, persons with disabilities, and women). We strongly believe that alleviating the under-representation of equity-seeking individuals will create a stronger OPG team and allow us to better serve the needs of our diverse communities.

In order to fulfill the above-mentioned purpose, priority in hiring may be given to qualified persons who self-identify as a member of equity-seeking groups as identified in the application process. This initiative constitutes a special program under the Human Rights Code/Canadian Human Rights Act.

Apply Now

Refine Your Search

administrative assistant jobs in oshawa, on

Executive Administrative Assistant

Office Administrator / Dispatcher / Accounts Receivable

Executive Assistant to CEO

Entry-Level Executive & Administrative Coordinator & Collections Administrator - Full/Part-time

Administrative Assistant

Administrative Assistant

Administrative Coordinator

Administrative Support Rehab

Administrative Assistant

Administrative Assistant

Optical Sales & Administrative Assistant

Executive Assistant - PFT

Administrative Coordinator

Executive Assistant to the Associate Vice President, Innovation and Research

Medical Office Assistant (MOA) (Full-Time/Casual)

Office Assistant

Receptionist/Music Office Administrator and Music Teacher

Legal Administrative Assistant

Auto Parts Yard & Office Assistant

Rehab Clinic Office Administrator

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