There are many audio and video recordings of Foucault found in various places online. I’ve tried to compile all these and put them in chronological order.

16 December 1961 ‘Raison et folic’, RTF, with Henri Baruk and Serge Jouhet – full programme (small download charge); 10 minute excerpt audio; partial and unreliable transcription of excerpt here

1962 on Raymond Roussel (audio)

Five linked radio discussions with Jean Doat for L’usage de la parole on RTF:

La folie en fête, January 7, 1963 (audio) Le silence des fous [The Silence of the Mad], January 14, 1963 (no audio; published in La grande étrangère, pp. 27-50; Language, Madness and Desire, pp. 7-24) La persécution, January 21, 1963 (audio) Le corps et ses doubles, January 28, 1963 (audio) Le language en folie [Mad Language], February 4, 1963 (no audio; published in La grande étrangère, pp. 51-70; Language, Madness and Desire, pp. 25-39)

29 February and 21 March 1964 – Rousseau, juge de Jean-Jacques (audio)

1965 – interview with Alain Badiou (video)

1965 – Philosophie et vérité – Badiou, Canguilhem, Dreyfus, Foucault, Hypollite, Ricoeur (video)

15 June 1966 – Michel Foucault à propos du livre “Les mots et les choses” (video)

1966 – Le corps, lieu d’utopies and Heterotopias (the latter mislabelled as 1980) – released on a cd in 2004 and published in the little book ‘Le Corps Utopique – Les Hétérotopies’ (more details on all this here).

1968 – Foucault, Umberto Eco and Enzo Melandri (short video with Foucault’s responses dubbed into Italian) [link broken]

2 May 1969 on l’Archéologie du savoir (audio)

1971 ‘The Lost Interview’ (video) – in preparation for below TV programme

28 Nov 1971 – discussion with Noam Chomsky and Fons Elders, ‘On Human Nature’ (video)

8 septembre 1972 – Michel Foucault à propos de son livre Histoire de la folie (on the re-edition of this text) – small charge to listen to this

2 October 1972 – on Bachelard (video)

1975 – Jacques Chancel interviewing Foucault (audio) – small charge to listen to this

Jan-Mar 1976 – Il faut défendre la société, Collège de France lectures

11 Jan 1977 – à propos de son livre “Histoire de la sexualité”, tome 1, France Culture

25 April 1977 – Justice : Qui sont vos juges ? (full video requires suscription); three free excerpts: Michel Foucault et la justice (video); La justice et la police (video); Michel Foucault et les juges (video)

4 July 1977 – Foucault, Clavel, Glucksmann and Jambet (video with paywall but has short excerpt to view; excerpt with paywall in short documentary on Clavel)

30 Sept 1977 – Meeting en faveur des dissidents soviétiques (with Sartre and de Beauvoir; very short video)

Jan-Apr 1978 – Sécurité, territoire, population, Collège de France lectures

2 Feb 1978 – Temps musical, Foucault, Boulez, Barthes, Deleuze et. al. (video; and a little discussion)

Jan-Apr 1979 – Naissance de la biopolitique, Collège de France lectures

October 20-21 1980 – ‘Truth and Subjectivity’, Howison lectures, UC Berkeley (audio). These lectures were given with slight variations on November 17 and 24 at Dartmouth College. Those lectures were transcribed and published in Political Theory in 1990 and have been republished since in The Politics of Truth and Religion and Culture. Variants between the Berkeley and Dartmouth versions are noted in that text, and in the L’origine de l’herméneutique de soi/About the Beginning of the Hermeneutic of the Subject.

late October 1980 – discussion with Hubert Dreyfus, and Dreyfus’s account of conversations with Foucault and the above lectures. (The link doesn’t provide a date, but Dreyfus’s comments indicate large parts were recorded between the Howison lectures and the seminars Foucault gave later that month at Berkeley. There is some interesting discussion in what are working notes sent to Paul Rabinow while they were working on their book on Foucault.)

7 May 1981- Interview with André Berten (video; transcript – also in Mal faire, dire vrai/Wrong-Doing, Truth-Telling)

6 Jan 1982 – opening lectures of L’hermeneutique du sujet, Collège de France (audio – followed by some of the 1984 course, but see below for a full recording)

? 1983 on the prison (audio)

Jan-Mar 1983 – Gouvernement de soi et des autres, Collège de France lectures

12 April 1983, ‘The Culture of the Self’, UC Berkeley lecture; and followup seminar with History on 13? April.

May 1983 – discussions – Rabinow seminars and phonecall

24 Oct- 21 Nov 1983 – ‘Discourse and Truth: Parrhesia‘, UC Berkeley – these were transcribed as the Fearless Speech book and are now available in a French critical edition Discours et vérité.

Jan-Mar 1984 – Courage de la vérité, Collège de France lectures

There is a lot catalogued as ‘Archives sonaires’ at the IMEC site, but apart from ones otherwise linked above these are all on cd.

There are many other resources on the ina.fr site, including documentaries and discussions of Foucault.

Finally, some video documentaries –

Michel Foucault contre lui-même (2014; requires subscription; short excerpt to view)

‘Michel Foucault par lui-même’ (video – part one; part two; part four) – part three seems to be missing; entire film with Portuguese subtitles; this has footage of Foucault I’d not seen elsewhere

and an episode of the ‘Beyond Good and Evil‘ series.

Any more out there? (Thanks to those who previously sent links)

There are lots more Foucault resources on this site – bibliographies, audio and video files, some textual comparisons, some short translations, etc.