Alexander or Alex Müller may refer to:

• K. Alex Müller (1927–2023), Swiss physicist and Nobel laureate
• Alex Müller (racing driver) (born 1979), German racing driver
• Alexander Müller (skeleton racer), Austrian skeleton racer
• Alexander Müller (composer) (1808–1863), German pianist, teacher, conductor and composer
• Alexander Müller (politician) (born 1969), German politician
• Alexander Müller (chemist) (1828–1906), German agricultural chemist

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