The 24-year-old midfielder has been leading the Reds in the absence of Chris Cohen, Andy Reid and Jack Hobbs.
“He has showed a maturity about his game in training every day,” Freedman told Forest’s official website. “I think he responds very well to that added pressure.
"He’s a fantastic technician who can add certain bits to his game and being the captain will only give him more responsibility.”
Lansbury has not been in great form or consistent this season, but he remains one of the best players in the Forest team.
The former Arsenal midfielder has scored eight goals and created 53 chances in 25 Championship appearances so far this campaign, while having a pass accuracy of 75% and a shot accuracy of 39%.
Forest’s recent turnaround of results has coincided with Lansbury’s upturn in form. The midfielder has been a driving force in central midfield and has scored six goals in his last six games.
Freedman seems to have got the best out of Lansbury and has given him more responsibility, which is only going to help him in the long run.
Lansbury, who has been on the books of Forest since 2012, will be key for the Reds next season when they re-launch their challenge for promotion to the Premier League.