Match.com (review: match.com)
Option to select "Vegetarian" or "Vegan" for the "Daily Diet" under the "Lifestyle" section.
www.match.com

Aubergine Introductions
Exclusive online introductions for vegetarians and vegans.
www.aubergineintroductions.com

GreenPersonals.com
Where vegetarian singles feel at home.
www.greenpersonals.com

GreenSingles.com
Free photo personal ads for singles in the environmental, vegetarian, and animal rights community.
www.greensingles.com

VeggieDate.org
VeggieDate is a community project of GreenPeople, whose mission is to provide resources to help empower people to live an eco-friendly, compassionate lifestyle.
www.veggiedate.org

Living Foods Personals
This personals system is for use by people who eat a minimum of 50% living/raw foods and believe in the living and raw food concepts.
www.living-foods.com

VeganSingles.co.uk
A site for vegans and vegetarian singles,it is intended to help enable people to get to know each other, for friendship, companionship, romance or marriage.
www.vegansingles.co.uk

Natural Friends
The perfect introduction agency for ethically-minded,
environmentally-sensitive, country-loving, health-conscious,
single non-smokers.
www.natural-friends.com

JewishVegan.com
The purpose of JewishVegan.com is to promote the practice of a vegan lifestyle within the Torah laws, both written and oral.
www.jewishvegan.com

Veggie Romance
Online dating for vegetarians and vegans. 100% Free Service - no charges for contacting.
www.veggieromance.com

Match.com (review) is one of the largest dating services that has the option to identify youself -- or your potential matches -- as Vegetarian or Vegan. When doing a custom search, go to the "Lifestyle" category, then look under the "Daily Diet" section.

So, can a general-interest dating service attract as many vegetarians as the specialty services? Apparently, yes. Our sample searches returned hundreds of matches, roughly 6% of all singles people in the Los Angeles area. You results may vary in other parts of the country.

Good luck!