Mrs. Ross is a minor Seinfeld character. She was the mother of Susan Ross, who died after licking toxic envelopes. Her first name is never revealed. Mrs. Ross has a son, Ricky, and a sister-in-law, Sara.

She appears to be extremely sarcastic and is constantly making fun of her husband. She is very relaxed and cheerful, opposed to her husband's grumpy and composed manner. She also appears to have a liking of alcohol, especially wine.

Mrs. Ross was portrayed by Grace Zabriskie, who first appeared in "The Cheever Letters". She was shocked to learn that her husband, Henry, had a homosexual, clandestine affair with John Cheever.

In “The Wizard”, Susan's parents admitted that they blamed George for Susan's death when they accompanied him to the Hamptons.

They appeared in “The Finale, Part 2” where they attended the trail of Jerry, Elaine, George, and Kramer in Latham County. After Dr. Wexler mentioned about Susan's death, Henry accused George of being a murderer while Mrs. Ross claimed that George knew the envelopes she licked were toxic. She and Mr. Ross were among those thrilled that George, Jerry, Elaine, and Kramer were found guilty.

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