Other
- Ildefonso Altar (Der Altar des hl. Ildefonso), a painting by Peter Paul Rubens.
- Alfonso und Estrella, an opera by Franz Schubert.
- Alphonso (mango), a mango found in India.
- Alphonso Psalter, a devotional Psalter.
- Convent of St. Ildefonso, a book by Regina Marie Roche.
- HMS Ildefonso, a British Royal Navy ship.
- Palacio Real de la Granja de San Ildefonso, a palace in the Spanish province of Segovia.
- Alphonso, a book by Stéphanie Félicité Ducrest de St-Albin, comtesse de Genlis.
- Church of Saint Ildefonso, an 18th century church in Porto
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