|Full Name||Oscar Fields|
|First Episode||Up in Barney's Room|
|Last Episode||Up in Barney's Room|
|Spouse||Almost Mrs. Mendelbright|
|Portrayed by||J. Pat O'Malley|
Oscar Fields is an out-of-townee, who takes a room in Mrs. Mendelbright's apartments. Eventually, Barney and Andy figure out that Oscar is nothing but a con-man, wanted for bigamy, extortion and a slue of other crimes. His latest target was Mrs. Mendelbright, whom he was trying to steal money from. He goes as far as to ask her hand in marriage. She accepts his offer and per his request to get her savings from the bank, she obliges. Mrs. Mendelbright, drunk off hard cider, doesn't notice when Oscar snatches her pocket book from the coffee table and quickly heads outside to get away. Andy and Barney are there to catch him before he can escape.
He is caught just in time- before he leaves with $3,600 dollars of Mrs. Mendelbright's money. He is portrayed by J. Pat O'Malley.