- Who is: Zhu Qianzhi in Philosophy
- Who is: Zygmunt Freud in Philosophy
- Who is: Zalman Sorotzkin in Philosophy
- Who is it: Zevi Hirsch of Zidichov in Philosophy
- Who is: Zisi (Kong Ji) in Philosophy
- Who is: Zbigniew Herbert in Philosophy
- Who is: Zhang Zai in Philosophy
- Who is: Zhu Rongji in Philosophy
- Who is: Zhang Heng in Philosophy
- Who is it: Zhubing in Philosophy
- Who is: Zhenren in Philosophy
- Who is: Zhang Dongsun in Philosophy
- Who is: Zhu Xi in Philosophy
- Who is: Zeki Saritoprak in Philosophy
- Who is: Zabarella, Jacopo in Philosophy
- Who is it: Zeami Motokiyo in Philosophy
- Who is: Zalman Schachter-Shalomi in Philosophy
- Who is it: Zera Yacob in Philosophy
- Who is: Zygmunt Bauman in Philosophy
- Who is he: Zarathustra in Philosophy
- Who is it: Zhuangzi in Philosophy
- Who is it: Zisi in Philosophy
- Who is: Zerahiah Ha-Yevani in Philosophy
- Who is: Zeno of Citium in Philosophy
- Who is: Zeno of Elea in Philosophy
- What is it: Zen Archer in Philosophy
- What is it: Zeno Effect in Philosophy
- What is it: Zettel in Philosophy
- What is it: Zeugma in Philosophy
- What is it: Zucchetto in Philosophy
- What is it: Zoosemiotic Turn in Philosophy
- What is it: Zulu Time in Philosophy
- What is it: Zen Buddhism in Philosophy
- What is it: Zonules of Zinn in Philosophy
- What is it: Zero-Sum Game in Philosophy
- What is it: Zuggernaut Effect in Philosophy
- What is it: Zymurgy in Philosophy
- What is: Zero-Order Logic in Philosophy
- What is it: Zeteticism in Philosophy
- What is it: Zoosemiosis in Philosophy
- What is it: Zenith in Philosophy
- What is it: Zenkoan in Philosophy
- What is it: Zetetic Argument in Philosophy
- What is it: Zone of Proximal Development in Philosophy
- What is it: Zero-Point Energy in Philosophy
- What is it: Zoosemiotics in Philosophy
- What is it: Zetetics in Philosophy
- What is it: Zen in Philosophy
- What is it: Zeitgeist in Philosophy
- What is it: Zeno's Paradoxes in Philosophy
- What is it: Zero-Point Field in Philosophy
- Who is he: Zeno of Citium in Philosophy
- Who is: Zeno of Elea in Philosophy
- Who is: Zhuangzi in Philosophy
- What is it: Zeno's Paradox in Philosophy
- What is it: Zeitgeist in Philosophy
- What is it: Zen in Philosophy
- What is it: Zetetics in Stoicism
- What is it: Zen in Stoicism
- What is it: Zeal in Stoicism