Clinical Trials Day2026 · Date · History
The Association of Clinical Research Professionals states Clinical Trials Day is observed annually on 20 May and documents its 2026 recognition initiative.
About Clinical Trials Day
Clinical Trials Day is observed on May 20 within the international clinical-research community.
The date commemorates James Lind’s May 20, 1747 scurvy experiment, a frequently cited milestone in the history of controlled clinical research.
Why Clinical Trials Day matters
The day recognizes people and organizations involved in clinical research and provides a focal point for education about how trials are designed and conducted.
It is a professional awareness observance, not medical advice about whether any individual should join a clinical trial.
History of Clinical Trials Day
The European Clinical Research Infrastructure Network states that it launched International Clinical Trials Day in 2005 to commemorate James Lind’s May 20, 1747 trial.
The Association of Clinical Research Professionals also observes Clinical Trials Day on May 20 and says it has organized and promoted the day since 2014.
Current public-agency messages and state/local proclamation initiatives show recognition of the date but do not create a federal or international statutory holiday.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
European Clinical Research Infrastructure Network (ECRIN)
ECRIN states that it launched International Clinical Trials Day in 2005.
European Clinical Research Infrastructure Network (ECRIN)
ECRIN is the documented institutional launcher of International Clinical Trials Day; this is organizational establishment, not statutory proclamation.
First documented observance
ECRIN states that it launched International Clinical Trials Day in 2005.
ACRP states that it has organized and promoted its Clinical Trials Day campaign since 2014, adding a major professional-association stewardship track alongside ECRIN’s International Clinical Trials Day.
Association of Clinical Research Professionals (ACRP)
ECRIN and Association of Clinical Research Professionals (ACRP)
ECRIN continues International Clinical Trials Day and ACRP maintains a current Clinical Trials Day campaign; neither is represented as an exclusive legal owner of the date.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
4 fields not established in reviewed sources
Later institutional actions
Later recognition, renaming, mergers or date changes are kept separate from original establishment.
How to Observe Clinical Trials Day
Use May 20 as the recurring date.
Recognize clinical-research participants and professionals through evidence-based education and institutional events.
Keep historical commemoration, professional stewardship and government recognition as distinct parts of the chronology.
For decisions about joining a study, use qualified medical advice and the study’s formal informed-consent process rather than observance-day content.
Clinical Trials Day Facts
Clinical Trials Day is observed on May 20.
ECRIN says it launched International Clinical Trials Day in 2005.
May 20 commemorates James Lind’s 1747 scurvy trial.
ACRP says it has organized and promoted Clinical Trials Day since 2014.
Government recognition or proclamations are not treated as creation of a statutory holiday.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
Association of Clinical Research Professionals (opens in a new tab)
Association of Clinical Research Professionals (opens in a new tab)
ECRIN (opens in a new tab)
ECRIN (opens in a new tab)
Association of Clinical Research Professionals — Clinical Trials Day 2026 (opens in a new tab)
Professional Association
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is Clinical Trials Day?
20 May annually The documented recurrence rule is: 20 May.
Does Clinical Trials Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is Clinical Trials Day an official public holiday?
The reviewed sources verify it within this scope: International clinical-research professional community; coordinated by ACRP and sector partners. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes Clinical Trials Day?
The reviewed sources identify European Clinical Research Infrastructure Network (ECRIN) as the proclaiming or establishing body. Current facilitation or coordination is recorded as ECRIN and Association of Clinical Research Professionals (ACRP).
Is Clinical Trials Day international or country-specific?
The documented scope is international or global: International clinical-research professional community; coordinated by ACRP and sector partners. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-07.
When is Clinical Trials Day?
Clinical Trials Day is observed on May 20.
Why is Clinical Trials Day on May 20?
The date commemorates James Lind’s May 20, 1747 scurvy experiment, widely cited in the history of controlled clinical research.
When did the modern observance begin?
ECRIN states that it launched International Clinical Trials Day in 2005.
Who coordinates Clinical Trials Day now?
ECRIN continues International Clinical Trials Day, while ACRP runs a parallel/current Clinical Trials Day campaign and says it has organized and promoted the day since 2014.
Does Clinical Trials Day provide medical advice?
No. The observance is informational and professional; individual trial participation decisions require the study’s consent process and appropriate medical guidance.
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