Grandam may refer to:

• grandparent
• Grand-Am, an auto racing sanctioning body established in 1999 to organize road racing competitions in North America
• Grande dame, a stock character, usually an elderly high-society socialite

• Ross Smith (Australian rules footballer)
• Ross Smith (soccer)
• Ross Somerville
• Ross Spur
• Ross, Stephen
• Ross Sterling High School
• Ross Sterling High School (Houston)
• Ross, Steve
• Ross Stevenson
• Ross Stevenson (radio presenter)
• Ross Stores
• Ross Stores inc.
• Ross Stores, Inc.
• Ross Stores Incorporated
• Ross's turaco
• Ross Surgenor
• Ross Sutherland (politician)
• Ross Symonds
• Ross, Tasmania
• Ross Taylor (ice hockey)
• Ross T. Dwyer
• Ross Technology
• Ross Theater
• Ross The Boss
• Ross "The Boss" Friedman