Mary Flynn may refer to:

• Mary Flynn, character in Alias Mary Flynn
• Mary Flynn, character in Merrily We Roll Along (musical)

• Holo/Holocaust Virus
• Holomatch
• Holometabola
• Holometabolism
• Holometabolus
• Holomorphic
• Holomorphic form
• Holomorphic function
• Holomorphic functions
• Holomorphic map
• Holomorphic sheaf
• Holon
• Holon Institute of Technology
• Holonomic
• Holonomic brain
• Holonomic brain model
• Holonomic brain theory
• Holonomy
• Holonomy group
• Holon (philosophy)
• Holons
• Holonym
• Holonymy
• Ho-lo-oe
• Holoparlor