diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiRegisterCell.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiRegisterCell.java
new file mode 100644
index 0000000..fd354ec
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiRegisterCell.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.net.pi.runtime;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onosproject.net.pi.model.PiData;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * A register cell entry of a protocol-independent pipeline.
+ */
+@Beta
+public final class PiRegisterCell implements PiEntity {
+
+    private final PiRegisterCellId registerCellId;
+    private final PiData piData;
+
+    private PiRegisterCell(PiRegisterCellId registerCellId, PiData piData) {
+        this.registerCellId = registerCellId;
+        this.piData = piData;
+    }
+
+    /**
+     * Returns the cell identifier.
+     *
+     * @return cell identifier
+     */
+    public PiRegisterCellId cellId() {
+        return registerCellId;
+    }
+
+    /**
+     * Returns the data contained by this cell ID.
+     *
+     * @return PI data or null
+     */
+    public PiData data() {
+        return piData;
+    }
+
+    @Override
+    public PiEntityType piEntityType() {
+        return PiEntityType.REGISTER_CELL;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        final PiRegisterCell other = (PiRegisterCell) obj;
+        return Objects.equal(this.registerCellId, other.registerCellId) &&
+                Objects.equal(this.piData, other.piData);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(registerCellId, piData);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("cellId", registerCellId)
+                .add("piData", piData)
+                .toString();
+    }
+
+    /**
+     * Returns a register cell entry builder.
+     *
+     * @return a new builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        private PiRegisterCellId cellId;
+        private PiData piData;
+
+
+        private Builder() {
+            // Hides constructor.
+        }
+
+        /**
+         * Sets the register cell identifier for this register.
+         *
+         * @param registerCellId register cell identifier
+         * @return this
+         */
+        public PiRegisterCell.Builder withCellId(PiRegisterCellId registerCellId) {
+            this.cellId = registerCellId;
+            return this;
+        }
+
+
+        /**
+         * Sets the data of this register cell.
+         *
+         * @param data protocol-independent data
+         * @return this
+         */
+        public PiRegisterCell.Builder withData(PiData data) {
+            this.piData = data;
+            return this;
+        }
+
+        /**
+         * Builds the register cell entry.
+         *
+         * @return a new register cell entry
+         */
+        public PiRegisterCell build() {
+            checkNotNull(cellId);
+            return new PiRegisterCell(cellId, piData);
+        }
+    }
+}
\ No newline at end of file