It was launched in the city's Millennium Square with a parade and other linked events were also held.
Staff from the West Yorkshire Crown Prosecution Service (CPS) joined in the celebrations of the diversity of the lesbian, gay and bisexual community.
The CPS said it was important to talk to people about tackling hate crimes against the gay community.
The service and the police believe not enough homophobic crimes are being reported by victims.
Organisers said public support for the event was amazing
Tom Doyel, who helped organise the event, said: "The amount of floats on the parade and the public support has been absolutely amazing.
"It's colourful, it's a festive parade, it's fun."
Fellow organiser Terry George said he felt proud to be a part of the parade.
He said: "When I was 17, in 1983, I came out, and it took me ages to pluck up the courage to try to make friends with other men. I remember standing across the road from the New Penny on a dark, rainy night - absolutely petrified of going in.
"There were no gay clubs then. Just the New Penny, the Red Lion and the Peel, with shut doors, guarded by doormen. You had to knock to get in and people got very edgy about being seen going in, or leaving.
"Things are so much better for gay men and women in the city now and this climate of love and acceptance is getting warmer all the time."
Courtesy of the the BBC