IDCA can refer to:

• Industrial Design Council of Australia
• Institute for Cultural Action
• International Data Center Authority (IDCA)
• International Design Conference at Aspen (IDCA)
• International Development Cooperation Agency
• Islamic Dawah Centre of Australia
• International Digestive Cancer Alliance

• NY 342 (1930-1940s)
• NY 35 (1927 - early 1940s)
• NY 361 (1931-1935)
• NY 390 (1930-1960s)
• NY 399 (1930s-1960s)
• NY 3C (1930-1932)
• NY 3D (1932-1935)
• NY 401 (1930s-1950s)
• NY 415 (1930-mid-1960s)
• NY 4 (1924-1927)
• NY 433 (1950s-1960s)
• NY 45 (1920s-1930)
• NY 51 (1920s-1930)
• NY 52 (1920s-1930)
• NY 56 (1920s-1930)
• NY6
• NY 6 (1924-1927)
• NY 62 (1920s-1930)
• NY 895
• Nya (2017 Myanmar Film)
• Nyaa.eu
• Nya Affärer
• Nya (A Long Walk to Water)
• Nyaa.org
• Nyaa.se