Nearly all Nobel Lectures and Speeches held at the Nobel Prize Award Ceremony and Banquet are available at this web site. (See, for example, Max Planck's Nobel Lecture.) The Banquet Speeches are only available in the language in which they were presented. (See, for example, speech in French by Maire Curie). They are also available in the Nobel book series Les Prix Nobel and/or Nobel Lectures.
Videos of Nobel Lectures can be found here: