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Should I use the pronoun "me" or "myself" when writing:

"The report was completed by (me/myself)."
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'Me' is correct.

The reflexive pronoun should be reserved for actions upon the agent ('I hurt myself at work today', 'I blame myself for the mistake') or as emphasis ('I myself see nothing wrong with the team', 'I did it myself'). After prepositions, the object pronoun 'me' should be used ('for me', 'with me' 'by me') except in the idiomatic 'I did it by myself' (= 'no one helped me').