How to Save a Marriage and Ruin Your Life is a 1968 American comedy romance film directed by Fielder Cook.

It stars Dean Martin, Stella Stevens and husband and wife Eli Wallach and Anne Jackson.

[2] David Sloane is a confirmed bachelor whose married pal Harry Hunter is having an affair.

Harry's actual mistress is Carol's next-door neighbor, Muriel Laszlo.

Roger Ebert said that it was made with "great goodwill", but also deemed it old-fashioned compared to then-recent films like The Graduate.