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Triangle is the only men's STEM fraternity experience, open to engineers, architects and scientists. We provide a social experience with a focus on academic success and professional preparation.

Support Triangle Fraternity

Initially, I joined as a way to make new friends and find people with similar interests. As I became a part of the brotherhood, I found that I could work on more professional skills in terms of working different positions in the organization. All of the positions I have held have taught me things that I can use later in life.
Jeremy Westrich

University of Wisconsin at Milwaukee

Triangle taught me how to lead, through professional development and executive position opportunities. The work I’ve put into this organization has reciprocated tenfold by providing me with the network, tools, and skills I need to further my career. I am certain that joining has been the single greatest decision in my life.
Kurt Paul

Cal Poly - Pomona

Five years ago, I wanted nothing to do with joining a Fraternity.  Here I am now, 5 years later, in Triangle, serving as a founder and President of a new colony. Triangle has a place in my heart now, and it will characterize my time in college.
Tyler Blankenship

Rose-Hulman Institute of Technology

Being in Triangle I’m surrounded by guys who want to make the most of their college experience. They’re guys who help each other with classwork, guys I go to football games with, and guys I enjoy being around. Joining Triangle Fraternity was the best decision I could have ever made.
Nathan Nash

Colorado State University

Total Initiates

Active Chapters

Current Active Members

Active Colonies/Interest Groups

Living Alumni


COVID Response Resources

What All Chapters Should Be Doing for Fall: Provide a copy of any campus, city or state policies related to COVID-19 to all active members and reinforce expectations Compose letter to parents to let them know… - Student health and safety is a primary concern - What...

Triangle COVID-19/Coronavirus Statement

Brothers, Alumni, Volunteers & Friends: Triangle Fraternity’s National Council and staff is committed to promoting the health and safety of its members.  As COVID-19 continues to spread and impact our partner institutions, Triangle is working to support our...

HQ News – February, 2021

Initiate #30,000 Update Triangle is about to celebrate initiate number 30,000! How long has it taken to reach this goal? Here's a list of our significant National Serial Numbers (NSN) and years it took to reach them. National Council will approve special recognition...

HQ News – January, 2021

Initiate #30,000 Will Happen This Spring! We are less than 100 initiations from initiate number 30,000! Who will be that initiate and from which chapter? Both the individual and chapter will receive special recognition, so make sure to report all initiations at least...

HQ News – December, 2020

With most campuses closed after Thanksgiving, we’re sending out HQ News a bit earlier this month. Here are things you need to know for December/early January… LTW Registration: Leadership & Training Weekend is January...

HQ News – November, 2020

TRIANGLE FRATERNITY Leadership & Training Weekend (LTW) This year’s LTW will be online, which is an opportunity for more members to participate. There will be tracks for chapter Presidents, Treasurers, Recruitment Chair, New Member Education Chair, Philanthropy/PR...

National Headquarters Address

120 S. Center Street
Plainfield, IN 46168
P | (317) 837-9640
F | (317) 837-9642

Office Hours

Monday through Friday
9 a.m. to 5 p.m. (Eastern)