Glynis McCants is Woman in The Secretary (Season 6 Episode 9).
Gordon Jump is Mr. Thomassoulo in The Butter Shave (Season 9 Episode 1) and in The Voice (Season 9 Episode 2).
Grace Zabriskie is Mrs. Ross, Susan's mother in 5 episodes. The first: The Cheever Letters (Season 4 Episode 8).
Gregory T. Daniels is Man on Corvette in The Parking Garage (Season 3 Episode 6).
Gretchen German is Donna (Cotton Dockers) in The Phone Message (Season 2 - Episode 4).
Harris Shore is the first Mr. Lippman, Elaine's boss at Pendant Publishing, in The Library (Season 3 - Episode 5).
Harry van Gorkum is Craig Stewart in The Wig Master (Season 7 Episode 19).
Heather Campbell is Photo Store Sheila in The Package (Season 8 Episodes 5).
Heidi Swedberg is Susan Biddle Ross in 28 episodes. The first The Pitch (Season 4 - Episode 3).
Henry Woronicz is Father Curtis in The Yada Yada (Season 8 Episode 19) and in The Burning (Season 9 Episode 16).
Hiram Kasten is Michael, Elaine's co-worker at Pendant Publishing in The Fire (Season 5 Episode 20).
Ian Abercrombie is the Justin Pitt in The Chaperone (Season 6 Episode 1).