Kate Martin is a fictional character on the soap opera, All My Children. She was played by Christine Thomas from January to early February 1970, then by Kate Harrington from February to October 1970, and finally by Kay Campbell, from October 1970 to April 1985. She was the matriarch of the Martin family, wife of Henry Martin and mother of Joe and Paul Martin. She was usually found in the kitchen cooking some of her famous recipes or offering sensible advice to Tad.