These are my notes on the lecture Probability Theory, taught by \textsc{Ralf Schindler} in winter 23/24 at the University Münster. \begin{warning} This is not an official script. %The official lecture notes can be found on % \href{TODO}{here}. \end{warning} If you find errors or want to improve something, please send me a message:\\ \texttt{lecturenotes@jrpie.de}. This notes follow the way the material was presented in the lecture rather closely. Additions (e.g.~from exercise sheets) and slight modifications have been marked with $\dagger$.