Joan Fitzgerald (or FitzGerald) may refer to:

• Joan FitzGerald, Countess of Carrick (1282–1320), daughter of John FitzThomas FitzGerald, 1st Earl of Kildare
• Joan Fitzgerald, Countess of Ormond (died 1565), daughter of James Fitzgerald, 10th Earl of Desmond
• Joan FitzGerald (died 1999) (1923–1999), wife of Garret FitzGerald
• Joan Fitz-Gerald (born 1948), former president of the Colorado Senate

• PCP/M-86 1.0
• PCP/M-86 2.0
• PCP/M-86 2.11
• PCP/M-86 3.1
• PCPO
• PC Points
• PCP-PEV
• P. C. Prakash
• P. C. Price
• PC Principal
• PC Principal Final Justice
• PCP site 1
• PCP site 2
• PCP use disorder
• P Craig
• P Craig Russell
• PCRAM
• PCR cycler
• P-Cresidine
• P-cresol methylhydroxylase
• PC revolution
• P:CRM
• PCR Methods and Applications
• PCR Methods Appl.
• PCR Methods Appl