The teenage striker, on loan from Chelsea, took his scoring tally with the Robins to eight goals in nine appearances in all competitions by scoring twice in the first half of City's disappointing 3-2 defeat to Sheffield Wednesday at Hillsborough.
Abraham gave the visitors the lead when firmly heading home Gary O'Neil's cross on 33 minutes before quickly doubling their advantage with an opportunistic header after Keiren Westwood had denied Josh Brownhill.
The 18-year-old now has six goals in seven Championship outings to lead the second division scoring charts.
In an action-packed contest in Sheffield, Wednesday saw defender Sam Hutchinson sent off with a straight red card while City midfielder Gary O'Neil was also dismissed for a pair of bookable offences midway through the second half.
Bristol's Lee Tomlin also missed from the penalty spot after Hutchinson's foul on Marlon Pack.
But not before Steven Fletcher had pulled one back for the home side in the 52nd minute when meeting Fernando Forestieri's corner with a goal-bound header.
Following the dismissal of O'Neil, Wednesday could smell an opening and drew level in the 75th minute through Barry Bannan who fired beyond Richard O'Donnell form 30 yards before the home side won in dramatic fashion through Kieran Lee who slotted home in the sixth minute of injury-time.
After the match, Abraham spoke of his brace on Bristol City Player: “Scoring two goals and not winning the game is never the best feeling.
“It would have been nice if I'd scored two and we'd won the game but at the end of the day it's a team sport."
City now sit 12th on the tier two table with 10 points from seven matches while Chris Hughton's Brighton are up to seventh with their first win in four league outings.
Two more goals tonight gutted with the result... We'll bounce back. Thank you all for the messages
— Tammy abraham (@tammyabraham) September 13, 2016