Isabel Clark may refer to:

• Isabel Clark Ribeiro (born 1976), snowboarder from Brazil
• Isabel Clark (nurse) (1885–1915), New Zealand nurse

• Stagmatoptera supplicaria
• Stagmatoptera vischeri
• Stagmaturgis
• Stagmomantis
• Stagmomantis amazonica
• Stagmomantis californica
• Stagmomantis floridensis
• Stagmomantis gracilipes
• Stagmomantis limbata
• Stagmomantis montana
• Stagmomantis montana sinaloae
• Stag moose
• Stagnant economy
• Stagnation (disambiguation)
• Stagnation of the Ming Dynasty
• Stagnation of the Soviet Union
• St Agnes Academy
• St. Agnes Academy (Houston)
• St. Agnes Academy (Memphis, Tennessee)
• St. Agnes Academy of Legazpi City
• St. Agnes Academy School
• St. Agnes Cathedral (Kyoto)
• St. Agnes Catholic Church
• St Agnes Catholic High School
• St. Agnes Catholic High School