Forty-nine people were killed in the June 12 massacre and dozens of others were injured.
In one 911 call, a man says his girlfriend is at Pulse, where she is hiding in a bathroom and sending him texts.
"There's like 18 people, two are dead, they're in the bathroom," the man says. "They're all scared to death, they all think they're gonna die."
He says his girlfriend is texting him because she's afraid the shooter will hear.
The man tells 911 his girlfriend said the shooters were there. "So I don't know if they're in the bathroom with her now or just in the club," the man tells 911.
At one point, he tells the dispatcher his girlfriend is not responding.
"It's OK, she might be with the deputies or she might be just trying not to let the light come out," the dispatcher replies. "I'm gonna stay on the phone with you."
In another call, a man says he ran to his car, away from Pulse, after hearing more than 10 gunshots.
"As soon as I heard that, we ran," he says, adding that he wasn't injured.
A woman across the street from Pulse also says she heard gunshots.
"A shot just hit the door of the place that I'm working in," she tells 911, adding that she wasn't injured.
Many calls were from loved ones.
One woman says her husband called her from Pulse.
Another woman tells a dispatcher her 20-year-old brother is in the bathroom.
A caller says her brother is in a Pulse bathroom with about 20 other people. She says her brother told her, "There's two dead people."
Another caller says his friend is at Pulse. He says the friend said he was shot in the bathroom and no one sees him.
"We called him because he posted on Facebook that he had got shot, so we said, 'Is everything OK?' He said, 'Got shot three times.' We said, 'Where are you?' And the response was 'In bathroom, tell them to check the bathroom.'"
In another call released this week, a calm father says his daughter called from the club to say, “She has been shot twice,” once in the leg and once in the arm, and is taking cover in the bathroom. “I’d like to get a call to see if she’s OK,” he tells the operator, who responds, “Take a deep breath and hopefully she’ll call you soon.”
ABC News' Aaron Katersky contributed to this report.