EXHIBIT 24.1

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Andrew Michelmore

Name: Andrew Michelmore

Director

Century Aluminum Company

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Jarl Berntzen

Name: Jarl Berntzen

Director

Century Aluminum Company

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Jennifer Bush

Name: Jennifer Bush

Director

Century Aluminum Company

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Errol Glasser

Name: Errol Glasser

Director

Century Aluminum Company

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Wilhelm van Jaarsveld

Name: Wilhelm van Jaarsveld

Director

Century Aluminum Company

POWER OF ATTORNEY

I hereby constitute and appoint John DeZee and Paul Sharobeem as my true and lawful attorney-in-fact and agent, with full power of substitution, for me and in my name, in any and all capacities, to sign on my behalf the Annual Report on Form 10-K of Century Aluminum Company for the fiscal year ended December 31, 2023, and any amendment or supplement thereto; and to file such Annual Report on Form 10-K, and any such amendment or supplement, with the Securities and Exchange Commission and any other appropriate agency pursuant to applicable laws and regulations.

IN WITNESS WHEREOF, I have hereunto set my hand this 5th day of December 2023.

/s/ Tamla Olivier

Name: Tamla Olivier

Director

Century Aluminum Company