der Referent
speaker
A person who gives a talk or presentation at an event, conference, or meeting.
Der nächste Referent spricht über die Zukunft der künstlichen Intelligenz.
The next speaker will talk about the future of artificial intelligence.

speaker / officer
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speaker
A person who gives a talk or presentation at an event, conference, or meeting.
Der nächste Referent spricht über die Zukunft der künstlichen Intelligenz.
The next speaker will talk about the future of artificial intelligence.

A 'Referent' (speaker) is a person who gives a 'Referat' (presentation). A 'Referat' is a talk or presentation on a specific topic, often in an academic or professional context.
Für das Seminar muss jeder Student ein kurzes Referat vorbereiten.
For the seminar, every student has to prepare a short presentation.
You can recognize the meaning 'Vortragender' (speaker) from the context. If a 'Konferenz' (conference), 'Tagung' (conference/meeting), 'Vortrag' (talk), or 'Publikum' (audience) is mentioned, this kind of person is meant.
Auf der Konferenz gab es viele interessante Referenten aus der ganzen Welt.
At the conference, there were many interesting speakers from all over the world.
You can recognize the meaning 'Sachbearbeiter' (administrative officer) from the professional context. Typical signal words are 'Ministerium' (ministry), 'Behörde' (public authority), 'Verband' (association), or its use as part of a job title.
Sie arbeitet als Referentin im Bundesministerium für Umwelt.
She works as an officer in the Federal Ministry for the Environment.
As a job title, 'Referent' (officer/adviser) is often combined with a subject area. Common examples are 'Pressereferent' (press officer), 'persönlicher Referent' (personal adviser), or 'Referent für Öffentlichkeitsarbeit' (public relations officer).
Der Pressereferent beantwortete die Fragen der Journalisten.
The press officer answered the journalists' questions.
speaker / spokesperson
'der Sprecher' and 'der Referent' can both be people who speak in front of others. However, 'der Sprecher' usually speaks officially on behalf of an organization, party, or company. 'der Referent' gives a talk at an event or is responsible for a subject area in a public authority. The words can be confused when someone speaks at an appointment or meeting. For a press statement, 'Sprecher' is more natural. For a presentation, seminar, or specialist topic, 'Referent' fits better.

Luisa hat den Referenten nach dem Vortrag noch etwas gefragt.
Luisa asked the speaker another question after the presentation.
Der Sprecher des Ministeriums erklärte die neue Regelung im Radio.
The ministry spokesperson explained the new regulation on the radio.