Administrative assistant jobs in Mississauga, ON and nearby

Administrative assistant jobs within 25 km of Mississauga, ON, Canada. Nearby towns and cities are included. Distances are straight-line, not driving distances.

Counted Sep 18, 2026

Hiring at a glance

View jobs

Open jobs: 135
Employers: 93

Advertised starting pay

Average starting payCAD / year: $53,516Across 18 listings

Employer-advertised starting pay, not employee salaries. Currencies and pay periods stay separate.

Where work happens

Remote: 0%0 listings
Hybrid: 27%37 listings
On-site: 73%98 listings

Employers hiring include University Health Network (7), BMO (4), MNP (4).

Sources & calculation notes

These figures describe the listings on this role page at the date shown, not the whole job market. Listings can change.

Employer-listed minimums from at least 10 listings per currency and pay period. These are advertised starting amounts, not employee salaries. Jobs without a minimum and unusual amounts are excluded.

Hybrid and on-site classifications may be inferred from descriptions. Check the original ad. How we count

About these jobs

Before you apply

Compare the office software, language skills and clerical experience requested in each ad. Job Bank lists secondary school and administrative training or previous clerical experience as typical requirements. Individual employers set their own criteria. Job Bank / Guichet-Emplois.

Guidance reviewed on September 16, 2026.

Based on the dated count above. Listings can change. How we count

Administrative assistant jobs in Mississauga, ON and nearby

Within 25 km

Save this search

2027 Wealth Management, Winter Administrative Assistant (4-16 months)
RBC
Toronto, ON
Full-time
Project Administrative Support Assistant
Newcomer Women's Services Toronto
Toronto, ON
Full-time
Position Title: Project Administrative Support Assistant
Human Resources Administrator
Canadian Armed Forces | Forces armées canadiennes
Toronto, ON
Full-time
As a member of the military, Human Resources Administrators provide administrative and general human resources support to all military activities.
Administrative Assistant
Nippon Express Canada
Mississauga, ON
Administrative Assistant, Ninepoint Partners
Ninepoint Partners
Toronto, ON
Full-time
Provide administrative support to executives and designated business teams.
Administrative Assistant - Bilingual (EN/FR)
Miller Thomson
Toronto, ON
Partner Administrative Assistant, Tax (Toronto)
KPMG Canada
Toronto, ON
Full-time
Administrative Assistant, IPM
CPP Investments | Investissements RPC
Toronto, ON
Full-time
Human Resources Administrator, Job ID #143
JVS Toronto
Toronto, ON
Contract
Administrative Assistant
Publicis Groupe Holdings B.V
Toronto, ON
Full-time
We’re looking for a dynamic, proactive Administrative Assistant to help support members of the leadership team at Leo. Reporting to the Executive Assistant, this person will assist
Private Wealth Administrative Assistant - Oakville, Winter 2027 (Co-op/Internship) - 4 months
BMO
Oakville, ON
Full-time
Administrative Assistant
Trevor Frances Recruitment
Toronto, ON
Full-time
Administrative Assistant
Artelia
Mississauga, ON
60,000 to 95,000 CAD / year
Full-time
Senior Administrative Assistant
Doane Grant Thornton LLP
Mississauga, ON
Full-time
Partner Administrative Assistant, Advisory Services (Deals Advisory)
KPMG Canada
Toronto, ON
Full-time
Partner Administrative Assistant, Advisory Services (Deals Advisory)
KPMG Canada
Toronto, ON
Full-time
Administrative Assistant, IPM
CPP Investments | Investissements RPC
Toronto, ON
Full-time
Administrative Assistant (Public Companies)
MNP
Toronto, ON
Full-time
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 internal and…
ScotiaMcLeod Administrative Support Assistant - Rosedale
Scotia Wealth Management
Toronto, Ontario
Full-time
Administrative Assistant - Schools
The Muslim Association of Canada
Toronto, ON
39,500 to 55,000 CAD / year
Job Description – Administrative Assistant (Schools)
Administrative Assistant
MNP
Burlington, ON
Full-time
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 internal and…
Office Administrative Assistant
Onyx-Fire Protection Services Inc.
Mississauga, Ontario
40,000 to 45,000 CAD / year
Full-time
Senior Administrative Assistant
DECIEM | THE ABNORMAL BEAUTY COMPANY
Toronto, ON
Full-time
Administrative Assistant - Schools (Olive Grove School)
The Muslim Association of Canada
Mississauga, ON
Full-time · Contract · Temporary
Job Description – Administrative Assistant (Schools)
Administrative Assistant
Charger Logistics Inc.
Brampton, ON
Full-time

Onyx-Fire Protection Services Inc.

Office Administrative Assistant

Mississauga, ON, Canada

Full-time

40,000 to 45,000 CAD / year

Apply About employer

Applications open in a new tab.

At a glance

Automatically prepared from the listing. Check the original description for the full requirements.

Jump to the original description

Responsibilities

The Key Accounts Administrator will collaborate with various departments to ensure detailed and accurate support for clients. Responsibilities include processing jobs, creating quotations, and managing document flow.

Requirements

Candidates must have a high school diploma and excellent communication skills. Proficiency in Microsoft Excel and Word, along with strong organizational skills and the ability to work independently, are also required.

Experience

0 to 2 years

Education

high school

Working hours

40 hours per week

Job type

Full-time

Work arrangement

On-site

Skills

Communication Skills
Microsoft Excel
Microsoft Word
Typing Skills
Data Entry Skills
Team Player
Organizational Skills
Attention to Detail
Multi-tasking
Independent Work
Customer Focused
Problem Solving
Confidentiality
Fast-paced Environment
Empathy
Integrity

Minimum pay

$40,000

Maximum pay

$45,000

Pay currency

CAD

Pay period

YEAR

Visa sponsorship

Not detected in the job text

Keywords

Fire Protection
Office Administration
Customer Satisfaction
Estimating
Operations
Service
Quotations
Document Flow
Data Entry
Confidentiality
Organizational Skills
Fast-paced Environment
Team Player
Communication Skills
Microsoft Excel
Microsoft Word

Original job description

Onyx-Fire Protection Services Inc. is the fastest growing full-service fire protection company.

At this time, we are seeking a permanent, full-time Key Accounts Administrator.

Responsibilities:

Collaborate and co-ordinate with the various departments within Onyx-Fire (Estimating, Operations & Service) is required to ensure detailed and accurate support for our clients.
Ensuring customer satisfaction during daily customer interactions with a strong attention to detail and a focus on fast turnaround and delivery for our clients.
Processing jobs
Creating quotations
Managing document flow

Required Skills and Qualifications:

High school diploma or equivalent
Excellent communication skills both verbal and written
Intermediate to advanced knowledge of Microsoft Excel, Word
Excellent typing and data entry skills
Ability to deal effectively and courteously with all staff, customers and general public
A proven team player with the ability to succeed in a fast-paced, rapidly changing environment
Strong understanding and commitment to the requirements of confidentiality
Exceptional organizational skills, attention to detail and the ability to multi-task
Able to work independently with minimum supervision
A positive, can-do attitude and customer focused approach that will enable you to deal with challenging situations with integrity, empathy and sincerity

What We Offer:

Top benefits.
Unlimited opportunity for advancement.

We are actively recruiting for this open role and will initiate onboarding as soon as a candidate is chosen.

Join Us: Headquartered in Mississauga, with deep operations throughout Canada, Onyx-Fire is the quality choice for local and national clients alike. We deliver preventative maintenance and project services to protect our client’s people and their properties.

Onyx Fire Protection Services is an equal opportunity employer committed to fair and respectful treatment of all individuals. We value diversity as a strength and strive to create an inclusive workplace.

In accordance with provincial legislation and our Accommodation Policy, we welcome accommodation requests throughout the hiring process.

Our high-performance culture provides an environment for people to grow and develop in their careers, take on more responsibility, and be part of a team that shares the same goals.

Apply by Dec 1, 2026

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