Canadian Actors' Equity Association (CAEA)

1. A national association representing performers, directors, choreographers, fight directors, and stage managers who work professionally in theatre, opera, and dance. CAEA provides its members with benefits similar to other unionized groups (health insurance, RRSP packages, etc.) and services (advocating for their members if there are problems on certain productions, etc). It also creates various agreements with other organizations (PACT, ACTRA; see below) in order to make sure their artists are paid equitable wages. For more information visit their website and contact an agent:
   
1. caea.com
   

UBCP/ACTRA

1. The Union of British Columbia Performers is an autonomous branch of the Alliance of Canadian Cinema, Television and Radio Artist (ACTRA), the national organization of professional performers working in the English-language recorded media in Canada, representing actors, stunt artists, voice artists, background performers, puppeteers, stand-ins, performance capture, hand models, dancers and choreographers. Similar to CAEA, but represents performers in film, TV, commercials, radio, and other recorded media. For more information visit their website: 
   
1. ubcpactra.ca
   

IATSE Local 118, Theatre Technicians

1. A labour union supporting technicians, artisans, stagehands, and craftspeople for live performance and entertainment in Greater Vancouver. Includes those that work in live theatre, rock and roll, trade shows, and conventions. For those in tech, design, and other theatre production craft, visit their website to see what their union offers:
   
1. iatse118.com
   

IATSE Local ADC659, Theatre Designers

1. A labour union supporting scenic, costume, lighting, sound, and video designers in live performance across Canada. Visit their website to learn more:
   
1. adc659.designers.ca

Professional Association of Canadian Theatre (PACT)

1. For aspiring producers and those interested in running their own theatre companies, this organization has many resources and benefits for both members and non-members. PACT’s mission is: “[being] a member-driven organization of professional Canadian theatres which serves as the collective voice of its members. For the betterment of Canadian theatre, PACT provides leadership, national representation and a variety of programs and practical assistance to member companies, enabling members to do their own creative work.” For more information, check them out at:
   
1. pact.ca
   

Playwrights Guild of Canada (PGC)

1. For playwrights, eventually, it may be beneficial to join the Playwrights Guild of Canada. PGC describe themselves: “as a national arts service organization, we offer over twenty-five programs that promote and protect playwrights. Through this work, we also provide many opportunities for the public to access, explore, and enjoy the work of playwrights.” For both non-member writers and producers, this is a great resource to discover professional Canadian playwrights and their works (e.g. how to contact individual playwrights to ask about the rights to produce their play) and take advantage of their programming. Here’s the website for more information: 
   
1. playwrightsguild.ca

Indigenous Performing Arts Alliance (IPAA)

1. A national arts service organization which provides leadership, support, representation, advocacy, and practical assistance for the development of Indigenous performing arts. Provides Indigenous artists with a range of resources, and the opportunity to advertise their work, publicize their events, and develop creative and strategic partnerships. 
   
1. ipaa.ca
   

Greater Vancouver Professional Theatre Alliance (GVPTA)

1. As you already surmised, we at GVPTA are an association that supports the theatre industry and community. We are a non-profit charitable organization whose membership includes theatre companies, theatre-makers and artists, and other organizations and individuals that work in or support theatre. We serve as a support system and advocate for theatre and the arts throughout Metro Vancouver and the province of BC, encourage new theatre audiences, and provide a forum for the discussion of mutual concerns within our industry. Highlights of services: our annual theatre conference, mentorship opportunities, Unified General Auditions, promotion of productions in the GVPTA Theatre Guide, and professional development. For full benefits and services, see:
   
1. gvpta.ca
   

Theatre BC 

1. The society describes themselves as: “the parent association for community theatre in the province since 1932. Its aims are to promote and encourage the development of community theatre by providing leadership as well as opportunities for participation, education and sharing in the enjoyment of diverse theatre experiences.” Supporting community theatre and theatre amateurs in BC, they provide workshop opportunities, presentation of theatre festivals, and produce the BC Playwriting Competition. For more information, see: 
   
1. theatrebc.org
   

Canadian Alliance of Dance Artists/West Chapter (CADA/West) and Canadian Dance Assembly (CDA/ACD)

1. Both are arts service organizations that provide support for professional dancers and choreographers of all dance forms. Each individual organization has specific services, benefits, and resources they provide their members. Best to research what each one offers here:
   
1. CADA/West: cadawest.org
   
2. CDA: cad-acd.ca