CSPC - Center for Sex Positive Culture, based out of Gallery Erato (an erotic art gallery) in Pioneer Square. Visit their website here
Subspace - Just outside of Seattle in Tukwila. They host a variety of events in a photo gallery space. Visit their website here
In general, the best way to find local parties, events, socials, and education is via fetlife.

Pan Eros Foundation - is the best place for local (in person) kink education in Seattle proper. Visit their website here
Wicked Grounds - is a longstanding San Francisco based kink organization with a huge amount of online education available. You can get tickets to their online events here
Full Circle Kink - is a local Seattle rope education org. They host a variety of in-person rope workshops and classes. Check out their website here
Crash Restraint - is a website offering free video-based rope content including safety and tying (from beginner to advanced). Check out their website here
Shibari Study - is a paid subscription offering high quality shibari instructional videos. Check out their website here
The Duchy - is a rope-focused education org and website. Check out their website here
Kink Academy - is a freemium platform offering a wide variety of online kink education. Check out their website here

Pleasure Hole is Seattle’s main BIPOC kink organizer. They primarily organize on their instagram here
Diadem Events / MxPucksAPlenty is another wonderful BIPOC-friendly kink organizer. They primarily organize on fetlife here
BIPOC Rope Group is a newly formed rope jam - monthly at Subspace. They primarily organize on fetlife. Join their fet group here
Onyx Northwest is a Leather club for Men of Color. Check out their website here

SEAPAH (Seattle Pups and Handlers) is the center of Seattle’s leather pup community. Check out their website here
Rope In Seattle - is a curated website with various rope events and education listed on a calendar. Check out their website here
HypnoKink Enthusiasts Group - is a group dedicated to hypno kink. They primarily organize on fetlife here
Seattle Latex Circle - is a group dedicated to latex. They primarily organize on fetlife here

Seattle Trans List - A community-sourced list of resources, for & by trans people. Visit the list here
Seattle Gender Affirming Surgery Providers - View the list here. (Provided courtesy of DoulaStevie)
Legal Name and Gender Change Checklist - View the checklist here. (Provided courtesy of DoulaStevie)

Kink Aware Professionals - listing of psychotherapeutic, medical, legal and other professionals who are kink, poly, and sex friendly. Visit their website here
Soteria of Washington - offers low cost or free private investigative services for marginalized and stigmatized communities (such as kink). Visit their website here
Poly Friendly Professionals - professionals across a variety of fields who are poly friendly. Visit their website here
San Francisco Sex Information - Provides free, confidential, accurate, non-judgmental information about sex. Also offers sex educator training, and a hotline for questions about sexuality, gender, and relationships. Visit their website here
OmgYes - Research-backed information, guides, and tutorials on women’s pleasure and intimacy. Visit their website here
Peer Seattle - General LGBTQ support for the broader Seattle area. Peer coaching, support groups, free HIV testing, and more. Visit their website here
Seattle Men In Leather - is the main group creating offerings primarily for gay leather men. They have some BDSM education. See their website here
Seattle Leather Service Corps - offers some education geared towards the leather community. See their website here