The World Cup winning allrounder will take over the reins from retired skipper Kirby Short, with Australia ‘A’ wicket-keeper Georgia Redmayne appointed as vice-captain.
Jonassen, 27, made her Women’s National Cricket League debut for Queensland in 2008 when the Rockhampton-based teenager was still at school.
She has gone on to play 66 WNCL games for Queensland as well as 63 T20 games for the Fire and 75 for the WBBL Brisbane Heat.
Her international career includes three Test matches, 68 One Day Internationals and 79 T20 Internationals, including the 2020 ICC Women’s T20 Final in front of 86,174 fans at the MCG.

Jonassen’s left-arm spin previously netted her career best figure of 5-12 in the final of the Tri-Series featuring England and India prior to the World Cup to provide her with her first five-wicket haul in a T20 International.
Jonassen, allrounder Delissa Kimmince and wicket-keeper/batter Beth Mooney are the three Cricket Australia contracted players in the Fire squad.
Queensland Cricket Chairman Chris Simpson congratulated the new captain and vice-captain on their appointments.
“The Board of Queensland Cricket was pleased to endorse the two roles when they were proposed and on behalf of the Directors, I congratulate Jess and Georgia and wish them and the squad every success this season,’’ he said.
“Queensland Cricket is proud of the efforts of all of our Queensland Fire players and justifiably considers them to be outstanding role models. They continue to assist us with growing the game further for girls and women by their actions on and off the field.”
The Fire squad for 2020-21 will take on a fresh look for the coming summer, with highly-rated prospects Georgia Voll, Ellie Johnston and Caitlin Mair looking to transition from Youth Pathways system into senior cricket.
Two of the teenage trio gained their starts in regional centres, with allrounders Voll and Johnston playing junior cricket in Toowoomba before commencing their Premier Cricket career with Ipswich/Logan.
Mair, a wicket-keeper who played her junior cricket with Albany Creek, gained her start in senior cricket with Sandgate-Redcliffe.
The 17-year-old is in her final year of school at St Rita’s.
The 16-year-old Voll made her Fire debut in the WNCL earlier this year taking 2-11 against Victoria at Allan Border Field.
A batting allrounder, she was player of the national Under-18 championships last summer, scoring 314 runs at 34.9 with a top score of 83, and 12 wickets at an average of 11.4 including best figures of 4-10.
Voll was also the third leading runs-scorer in the Katherine Raymont Shield, hitting 801 runs at 47.12 with two centuries for Sandgate-Redcliffe. She is in Year 11 at Brisbane State High School after previously attending Fairholme College in Toowoomba.
Johnston, who hails from Dalby, hit three half centuries as an opening batter for Queensland at the National Under-18 titles and has been a strong contributor for the Hornets in Premier Cricket. She also bowls leg-spin and finished as the team’s leading wicket-taker with 20 dismissals.
The 17-year-old is in her final year of schooling at Dalby SHS.
Fire coach Ashley Noffke said the trio would join the likes of allrounder Charli Knott, Courtney Sippel and Lilly Mills in further developing their individual skills with the Queensland squad.
“The opportunity has come for us to give them a chance to take the next step,’’ he said. “The number of women and girls playing the game in Queensland continues to increase and it is wonderful to see the array of talented players who are emerging as a result of that growth.”
“We are working hard as a team during the off-season and our younger players certainly will benefit from the increased exposure to the senior players in our squad like Jess, Georgia, Beth Mooney and Holly Ferling,’’ he said.
Sandgate-Redcliffe run machine Tess Cooper has also earned a recall to the Fire squad after dominating the Katherine Raymont Shield.
The 23-year-old Cooper, a physiotherapist, has played 10 matches for the Fire with her last game in 2018-19. She produced a commanding case for her return to the squad with 1025 runs at 51.25 in all formats for the Gators on the way to their premiership last year.
Allrounder Knott also comes into the squad on a full contract. She was a member of the WBBL Brisbane Heat squad last season and played one match for the Fire during the summer.
Queensland will bid farewell to Short as well as allrounder Sammy-Jo Johnson, who has relocated to Sydney for family and business reasons, and Jemma Barsby and Josie Dooley who have opted to seek opportunities interstate.
Seamer Haidee Birkett was also not contracted after an injury-hit season that included foot surgery.
The Queensland Cricket Board also ratified the appointment of a stand-alone Female Selector to work alongside Fire coach Ashley Noffke with the role to cover emerging talent as well as State selections.
2020-21 Queensland Fire Squad
Cricket Australia Contracted Players
Jess JONASSEN (University of Qld)
Delissa KIMMINCE (Gold Coast)
Beth MOONEY (Sandgate-Redcliffe)

Queensland Contracted Players
Grace Harris (Wests)
Laura Harris (University of Qld)
Georgia Redmayne (Gold Coast)
Mikayla Hinkley (Valley)
Charli Knott (Valley)
Tess Cooper (Sandgate-Redcliffe)
Georgia Voll (Sandgate-Redcliffe)
Georgia Prestwidge (Valley)
Holly Ferling (Wests)
Courtney Sippel (Wests)
Meagan Dixon (Wests)
Lilly Mills (Sandgate-Redcliffe)
Caitlin Mair (Sandgate-Redcliffe)
Ellie Johnston (Ipswich/Logan)
In: Georgia Voll, Charli Knott, Tess Cooper, Caitlin Mair, Ellie Johnston
Out: Sammy Jo Johnson (NSW), Josie Dooley (SA), Jemma Barsby (SA), Haidee Birkett (uncontracted), Kirby Short (retired)